I know that proficiency can be acquired trough picking class or selecting a feat. But I cant seem to find a feat that would give training in superior melee. Do I need to pick a feat for only one type of weapon? Also, what are the penalties for using weapon you don't have proficiency for and are these penalties reduced if PC has training in similar weapons? For example, use of of military melee weapons while have training only in simple.
Reason for this question is that I want to give a human Warlord a waraxe for that 1d12. For some reason char builder shows that I do have +2 proficiency for it all trough warlord proficiency list doesn't have superior melee listed.