Even though it might be just another custom feature, it's not about being annoying to me, or annoying in general, it's about improving (or trying to) the quality of something, in this case, world PvP, that's just my goal. I don't suggest anything for myself only, I try to bring the word "quality" into the game by simply not allowing other gankers to instantly run away when they are about to get killed. No, corpse camp is not annoying since it's easy to avoid it (not my fault that other players don't know how to manage it), but the thing is, we're just talking now about WG, which corpse camp doesn't exist due to players being ressed up on graveyards around the map.
So, I can't really answer if being able to vanish from Wintergrasp while in combat is a bug or not, so, if it is, I'll make a topic on the bug tracker as you said (and obviously praying it won't get rotten somehow...), but if it's not, take it as a simple suggestion then, and that's the only thing I can talk about. Forget the BG or RDF queue pop, I was just refering to the "leave WG" while in combat (or when you're about to get killed).