I don't need the potions, but potioneffect gets its effect from the potion id. The current potiontypes array only has 32 elements and 20 or so are already occupied by existing potion effects. Is there any way to make more than 32 potions?

Well, an easy way to do it is to just edit it to have more potions, this will only conflict with mods that also edit that class, or you could make a mod specifically for that purpose(such as 4096 BlockID fix) or you could ask Lex or Eloraam to add a hook to forge

Thank you ^^. I'll put it up as a suggestion for a hook