I've thought a bolt was poorly placed a few times, and worried about hitting a ledge, used a short quickdraw, but decided to clip the rope in the top biner.
This would marginally reduce the fall by about 15cm, which might matter, but the disadvantage is you could crossload that carabiner, and melt the top of the quickdraw if the rope lays accross it and u fall.
It would be better to just pop a single carabiner on that bolt then, but there's still some risk of cross loading it?
Post edited at 15:09