I've been researching this topic, and it looks like getting
Chrono Cross to support widescreen will be quite the undertaking.
There's a community over at the
PSXS2 forums dedicated to creating such widescreen patches for PSX games. However, the method seems to be quite the trial and error, with many games simply not compatible with that method. Worse, the
OP later said that
Chrono Cross is one such game, and that they do not expect it to be patched anytime soon without ASM coding. That was four years ago with still no news on it being supported.
The only other lead I found was
this YouTube video from earlier this year, with incredibly little information on how it was done. Yet, it
does appear to be true widescreen and not just stretched. There are a few issues, however; the dialogue text is misaligned, and there are noticeable graphical issues during battles.
If anyone has any information on how widescreen might be implemented, we can discuss it here.