Well, it would certainly lend an interesting dynamic to creating new techs for them to play with. All 7 people against Lavos? What would a 7-person tech look like?!
A combination of Luminaire, Ice 2, Flare, Frog Squash, Shock, Triple Kick, and Dark Matter... Hehe, the name for that tech would be "PWNAGE."
It could also be interesting to have the party split up in some areas, and explore what kind of stuff could go on that way...