Ok, I have an answer to the Avatars problem - and maybe even the Signiture problem. All the non-member constants on here like DevilHack I think will even agree with me on this.
On other Forums, the Avatar is only allowed over a certain level - could we not do this on here with only allowing Junior Members - or Members to have their own personal Avatars; allowing people who just want to have a nice Avatar and are trustworthy to have it - and stopping one time posters and people who would screw the system to have one?
I don't know whether you could do this with the Signiture Problem - btu that's also another good idea!
A Knight is sworn to Honour. His heart knows only Virtue. His blade defends the helpless. His might upholds the Weak. His word speaks only truth. His wrath undoes the Wicked.