I've done that plenty of times myself, so I feel the pain, but I feel like I run through FATE circles quite often when I'm just trying to get somewhere else. It would get a bit annoying having your HP/MP drop instantly just because you didn't run around the outskirts of the FATE.
When I'm in FATE mode, I just use a quick macro - /levelsync on - and bind it to an easy key to hit. With that said, I'd be down if this was an option you could toggle in your settings.