I have a question I think is on topic both here and on another SE site. Can I ask the question on both sites, or is this bad form? Should I link the two questions together if I ask them on both sites? If so, how?
Ultimately, there should be a way to tag questions for multiple sites at a time, the same way you add multiple tags. I'm not saying to allow people to "push every button on the elevator", but if several sites have an established 'Photoshop' tag, you should be able to assign it, regardless of which SE site you are using. Naturally the community will police anything off topic per site anyway.