I suppose that could happen, but I think the ground wire is at the top of the pull, so once you release the lever, it should remove that ground from the circuit and shut the TT off then and not at the very bottom of the release....does that make sense?
If a thief were able to do that, that means that little ground point is grounded for as long as ebrake pull. My ebrake light shuts off as soon as I press the button and go down one click. My ebrake is still holding the inner drum pretty tight at that point still.