Hmmm...despite the fact that this topic seems fossilized, I'd still like to ask a question, though if it doesn't get answered due to lack of interest (or because it was already answered elsewhere), I won't feel offended:
One must know the proper rituals of necromancy if one is to revive the dead and extract wanted information.
I think that Magus does have, and later refines, a magical control over time and space. To begin, its been mentioned in the game that the core elements as used by innate magic users are the forces that govern the universe. A universe is all matter and space as a whole, so manipulation of the universe, or utilizing these elemental forces, manipulates space. By the definition alone, we have 'yes' to 50% of the posed question. Now, in years past, there was brought up a mention of azala utilizing power in a comparable way. However, in azala's case, the tip off is found in his ability psychokinesis, the ability to move objects by mental power alone. The repites were acknowledged as being smarter than the apes, and a common element in stories is a refined intellect leads to 'mind over matter' effects, or psionics. His "teleportation" tech is probably the same psionic as the one he uses to move your characters about, but it given a different name to prevent confusion. Psychic powers probably aren't on the same level of space/time manipulation here.
On a side note, azala's display of psionic power leads me to think the draconics wouldn't even develop Elements that apprear in CC in the first place, so any involvement about how that system would explain time/space manipulation, I dismiss.
Now, as far as time manipulation goes, I get the first tip off from janus' famous reference to the 'black wind.' From talking to other people from Zeal, it is revealed that those who can use magic have an 'aura' about them. Aura's then have something that can be read. Janus' insight, and Schala's confirmation, may have been based on what they could interpret from this aura. He might not be specific about who was going to die for a number of reasons.
1) Because several people were going to die from Lavos' attack.
2) Because the constant presence of magic makes it difficult for him to completely read, but due to his stronger abilities, he's at least able to narrow it down to Chrono's group. Schala, who is either not as capable in this regard or at least preoccupied with concerns for her mother, doesn't notice this when she meets with crono and company.
3) he's just being an ominous brat. But even then, his mention still merits noting, because schala still senses something too.
In the case that Janus is only able to single out Crono as the tragic element here of the 'black wind' what makes him stand out then? Because Crono is important to time. Gasper mentions that the Chrono Trigger only works for those who are important to time, and since it works for Crono, he is then important to time. When Magus mentions the black wind when you fight him in his castle could have 3 possible reasons:
1) Again, he is sensing that Crono will die. However, at this time he thinks its because he (Magus) will kill Crono.
2) He is sensing his own death. Without Crono/Frog's interference here, its assumed that Magus dies here when he summons Lavos. Since time/the future isn't certain/absolute he could still sense the potential for significant deaths, as I would say the Magus is also important to time.
3) He's just saying it to be intimidating. However, I doubt that the "black wind" would necessarily be interpreted at 'death' to Crono and crew, it might be a wasted taunt, and thus not something Magus would say, as he doesn't seem to be one who waste words.
Additionally, when confronting Magus after Crono's death, how does Magus know that the Guru of Time is even still alive, let alone have the means to bring Crono back? It could simply be that Magus knew from his own experience that Gaspar simply when through a time hole, and the Chrono Trigger was started/completed beforehand, and Janus knew of the project.
The next factor in wether or not Magus can manipulate time is because Marle can do it. Marle's spell, haste, accelerates a person's actions, or enhances their frame of time. As Marle is a descendant of the Zeal royal line, or at least assumed so since the family pendant is passed down, I take this is a genetic reference to the Zeal command over time/space, which is not only evident by Schala sealing a time gate, but also in Queen Zeals Black Omen. While the Omen's ability over time may be due to either its connection to Lavos, and his abilities over time/space or a built in feature since the Ocean Palace was designed by wise men who manipulate time themselves, is irrelevant to my point. Significant features/boss battles aren't repeated in the Black Omen through time, because? Because like Dalton (who mind you is another example of manipulation of time/space) Zeal probably summons those creatures through a time void at the moment you come to attack her. Once the creature has been pulled through time, and killed, it can't be pulled again, since it no longer exists, and therefore can't be there to fight you in another time.
So why doesn't magus have haste, or any other nifty time spells in his arsenal then? Probably to condense his already impressive repertoire of spells, and also give a unique skill set for each character for various strategy combinations, particularly since Marle is already on the weak side of pairings. The one exception to this is his skill 'black hole' While i don't think this is a real 'black hole' by any means, I think its a reversal of what Dalton and Zeal do. Instead of summoning creatures through a void (that I guess they stored in there) he instead simply tries to force them into one. How he does this can be simply like how Dalton managed to do it, by managing to summon nothing. So Magus summons 'nothing' and instead something gets sucked in. The randomness factor is probably just a game mechanic so players can't do it to everything as a means of simplifying combat, or beating fights they might not have otherwise won.
So does this mean Magus opens up time portals and can do whatever he wants with history? Not Necessarily. Here I'm just suggesting that he has at least some form of control over time/space, and not a complete mastery of it.
