Safedock OFF on arrival... stay put!
Just thought I'd mention that if you pull too far onto the stand without the system being active (let's say if your ground crew have not yet arrived to switch it on...) then you may inadvertantly stop the system working when they do arrive.
Que further delay waiting for a Marshaller...
I'm only a spectator to this as an Ops person, and I know you are under ATC pressure to clear taxiways etc. but if you're stuck half on the stand waiting even longer for a marshaller, chances are nobody can get behind you anyway I guess?
If the situation allows I'd say it's better to stay put and get on to your handling agent who will most likely say, 'they're on their way...' 
Not sure if this is common knowledge at the pointy end but I do see it happen quite frequently. For a short(er) delay, wait for the safedock.
I appreciate the ideal would be the staff there waiting in the first place, but it's not a perfect world!