<<On the down side there would be a little more work for GND control. If you had a problem on start, getting back to the bay would be an issue. Weighing the occasional probleem against the savings still makes this a good idea.>>
With the greatest respect, some people on here really want to spend a couple of hours in the Tower at Heathrow or similar airport from where they might just get a different view. Slow towing aircraft can provide real headaches and there is no doubt that, overall, things would slow down. I'm sure Gonzo would confirm all this.