There is no way to delete an answer that you have posted. I find it all too easy to accidentally post an answer instead of a comment, (maybe some better posting differentiation is needed?) and it's not possible to delete the mistakenly created answer ater copying the content to a comment.
On the web I don't need to "vote" to delete my own answers. This has nothing to do with allowing voting on deletion, but the direct (and immediate) deletion of my own answers to questions which doesn't require any voting of any form at all. I just press "delete" and it's deleted.
