There’s also the fact that they’d be a little too weak to be useful, even summoning 1d6+2 at their maximum of 4 HD.  Maybe if they got the Mob template (http://www.realmshelps.net/monsters/templates/mob.shtml) added on and were then given something like a hive mind trait that let the mob keep the base creature’s mental state and ability to use special abilities...<br/><br/>Of course, that would take a little home-brewing work. ^^;