tldr: If a question turns out to be an unintentional duplicate of another site's question (and OP does not oppose due to intended different audience) allow cross-site dupe closing.
I asked this question on unix.SE, which turns out to be basically a duplicate of this SU question. Both sites are considered equally valid (although I'd rather see these questions on unix than on SU) for the question, but were both questions on the same site mine would most likely be closed as a duplicate. Migrating either question is against common sense since neither is off-topic, but that is currently the only way to close as duplicates. I therefore request:
Allow to close questions that are on-topic on multiple site to be duplicate-closed without requiring senseless migration
Examples (please expand if you have some):
- Using Multiple SSH Public Keys <- How to use ssh-agent with multiple (valid) keys and yet choose which one to use?
- Embed LaTeX math equations into Microsoft Word <- Type math formulas in Microsoft Word the LaTeX way?
Side-note: I consider this quite different from the Close as cross-post request (closed as duplicate of the link to cross-posts request for some reason), since a cross-post is the same question asked on multiple site on purpose to get potentially different answers. This request is however about being able to close a question as an accidental duplicate to another question that may actually already have "the" answer.