Battlescript variables...

You probably mean "in the SNES memory", not "in the ROM file" right?

I can't say to know how exactly SNES handles stuff, clearly the ram is not inside the rom, but now i understood that ram variables are in 7E0000 area of the rom, anyway...

You could probably get away with using VAR004 - Brave New World used it for a few fights up until 1.7, and we never had any problems. That said, Four global variables plus one local variable should be plenty for anything you want to do. If you find you need more, try simplifying your logic.

What i'm actually using the other variables for is something completely different, using them for enemy AI is the most trivial use...

Too bad anyway, var 36 is bounded to slots, so i lost the chance to use them for something way more useful