I just installed this hack on 2.2.9 with no problems... though in the usergroup.php you might want to switch
Code:
makeyesnocode("Can use signature","canuseavatar",$usergroup[canuseavatar]);
makeyesnocode("Can use avatar","canusesignature",$usergroup[canusesignature]);
to this...
Code:
makeyesnocode("Can use avatar","canuseavatar",$usergroup[canuseavatar]);
makeyesnocode("Can use signature","canusesignature",$usergroup[canusesignature]);
It shows up backwards if you don't reverse 'em.