this is the official unofficial trick editing FAQ for THPS ... if you want to make your own mods, this is what you need. we don't know that much about the THPS files, but the more people we have working on it, the more stuff we'll discover, so give it a shot :)
an HTML version of this file will be up sooner or later - but for now it's just a txt file ... i recommend rightclick and "save as..." to read this thing.

THPS2 trickedit FAQ 1.0