I have just discovered secondhand that a non-CW answer to a CW question will still accumulate rep normally. Is this by design, or is it an uncaught edge case? Either way, is it a Good Idea? The post that inspired this question is here; see the comments. (EDIT: although I asked this question in a general way, I'm primarily interested in the case where this results from merging of questions.)
A discussion about a closely related topic was held about a year ago, but it doesn't seem that any consensus was ever reached, let alone officially blessed by a Valued Associate. Also, I believe that that discussion was held before the "merging questions" capability existed.
EDIT 2: Hm, there seems to have been some confusion. I wasn't asking whether this behavior could exist — an example is linked to in the post. I was asking whether it was intentional and positive (as opposed to, say, a known but undesired side effect of implementing the "many edits → auto-CW" rule). But the consensus — using that term loosely — seems to be "case by case basis, flag for a mod if you find a qualifying case."