Since you now get exp from companion kills, it would seem that you should get exp from Mysterious Stranger/Miss Fortune kills as well.
I mean I like having them show up, but, I do not want them taking all my exp as well.
It is not a huge deal, it just makes my vats spam build much less fun, until level 30.
There also may or may not be problems in the game related to them stealing kills, karma, and faction.
Just putting it out there.
EDIT: If it is an issue getting a % of damage on the target before they kill, or some other game mechanic, let me know, as I welcome all such information.