a mods jurisdiction

[Ron Burgundy]

for example, can a mod who is designated only to the off topic forum go to the general forum and infract people for trolling/post mod warnings or w/e.

[Arlee]

Mods only infract within their own forums (there are rare exceptions to that though). However, if a mod in a different forum sees something wrong they will usually bring it to the attention of a mod in that forum. Super Mods and Admins can obviously infract anywhere.