I saw on the wiki that if you complete we are legion, papa khan makes you his heir then if you kill him you become leader, is this true? and are there any perks to this?

I just heard about the heir part if you say do We Are Legion, or whatever quest involves Nelson and speak with him. Now if you kill Papa will you become "leader" automatically? Don't know.

Also the script for Papa telling you you're his heir is broken. Or was for me both on PC and 360.

Either way even if you bypass heir and become "leader" you won't get any new options.

If that's possible at all in the first place

I doubt it, and I doubt even if you do become leader you will have any more options open to you. What did you expect, being able to send your minions on raids? Definitely not.

Now there's an idea!!!!!!!!!!!! Instead of ME running around the Mojave, I can delegate and my minions will run around, completing objectives! LOL