I was curious if anyone knows if there are any other bonuses for manifesting psychic powers if you play a Imperial Psyker:

The only ones I found were:

Invocation (doubles you WP bonus) and requires a full action.

Power Well Talent which can be taken only twice (If you choose the Scholar route) gives a +1 to all power rolls up to +2 max.

and Discipline Focus Talent grant +2 to power rolls only in that discipline.

Did I miss any?

Well there's the Corpus Conversion talent, that since the errate probably won't be used by anyone, and also, when you've learned ten or more powers in a specific discipline, you're counted as a master of that discipline and lower all those power's PT with 5.

Yeah I doubt I'll ever use Corpus Conversion just because my Toughness started at 35 and I don't want to lose that bonus.

That's right I forgot about mastery. So I guess that's it...

Thanks