I've been editing a question and I realized there is already a suggested edit pending. If I select "Improve" instead of "Accept", what is the impact of this in the total of accepted and rejected edits suggestions to the user?
It counts as being accepted by the Community♦ user.
The suggested edit is accepted by the Community ♦ user, and the proposing editor gets their full +2 reputation points.
See this question for more details. I'm inclined to agree that we need a "Reject and Improve" button. @random is right that more people need to man up and hit "Reject", but until they start doing that, I see far too many bad edits being approved. I reject lots of edits that two other people go on to approve, and with the current system, I'm forced into remembering to go back and make the rest of the edits I think need to be made.