Not sure about the production SE2.0 database schema, but if it is anything like the data dump (data.stackexchange.com) or what is revealed by the StackApps API then all actions that directly affect rep is a "vote". This would put accepting questions in the same boat as up/down-votes, as well as bounty setup, bounty received, accepting an answer (+2 etc.
All rep changes are grouped (within the same day) by post (question/answer) as a single [x vote] node, with the breakdown only shown when you expand it.
I would say this is by-design, you would be better off tagging it as a request, in which case it may be considered or declined. As a bug, it will earn just status-bydesign.