When I find an answer that is useful for me, I like to upvote it. In the same way, I like to upvote the question too, because it made it possible for that answer to be written in the first place.
However, I have to scroll the page up each time. I think that this could be improved, and that the fix could finally lead to benefits for the entire community.
So it would be nice if, when voting an answer, a popup appears asking the user if he wants to upvote the question too.
This way, votes on questions should increase, thus allowing a better reward to be given to question authors, which should lead (ideally) to better questions.
This is how I would phrase it:
Thanks for your feedback! Would you like to upvote the question too?
I wouldn't use too much words, because they would just involve more cognitive-load for users who already use it as a time-saver.