MyBB Community Forums

Just wondering whether there was any way to have different sets of Post Icons for different forums? For example-

Default:
Forum fid 15:
Forum fid 31:

So forums 15 and 31 use only their respective post icons, while all other forums use the default set?

Or alternatively, post icons restricted to moderators/usergroups?

EDIT: I was meant to delete this after reposting to Plugins & Code Modifications, but apparently I don't have the access to delete threads :|