Allow multiple voting on entity programatically

I have user entity. I have a "drive" content. Both have fivestar field.
I want user.fivestar as average of all votes on all drive content by author(user entity).

This small patch is needed. Anybody can see any reason why not to accept it? Without that each user can vote only once on each entity (votingapi puts his IP as votingapi_vote.vote_source field). With this small hack i can simply use all parameters when calling _fivestar_cast_vote().

Anybody can see any reason why not to accept this patch?