I wanted to reported a bug but I wasn't sure about it. So I wanted to tag it "possible bug" instead of bug. But the system won't let me : must include one of these tags -- bug feature-request discussion support.
I think it should be in the list.
Don't worry about it (too much).
Tag it as a bug. If it isn't the community will fix your tagging.
You report it as a bug. If it turns out not to be a bug, it will be retagged
status-bydesign, and all is well. Nobody will be mad at you for tagging a possible bug as a bug, that's what bug tracking is all about. :)
I think this is a good idea, and it would also cover those cases where you're not sure whether the problem should be considered a bug or a feature-request.