I personally think that if a question (for example, this one) is closed, it should not allow any further changes: comments, answers, edits, down-votes, or up-votes. In order to make modifications to a question, it needs to be re-opened.
EDIT: Upon review of answers, I can see the need to allow comments and edits.
So my questions are:
- Do the down-votes continue to penalize the OP?
- If the OP is regretting the question (as I understand from this Meta discussion), can he/she flag the question themselves and ask for it to be removed.