Rule action to give points to node/comment author and not the current user

I am using an implementation with Flag + Userpoint rules + Rules
I want to give user points to users whenever their content is flagged 'up' and remove points when content is flagged 'down'.
However, under rules actions for userpoints, I only see 'Flagging user' as an argument. Is it possible to provide a patch that would give 'Node author' and 'Comment author' as arguments?
I am not a coder but can offer to test the patch to make sure it works as intended.