Always use getOMClass in findPkSimple 

It was bugging me for a while - shouldn't getOMClass be always used, disregarding table inheritance?

And another question if i may:
if getOMClass is a way to go with extending models, is it safe to assume that in namespaced project <code>substr($modelClass::PEER,0,-4).'Query'</code> will always yield proper Query classpath?