I guess hobbs is at its worst if you're the 1st up on a very cold winters morning and have 5 mins on the clock before you even move.
Take your feet off the pedals for a couple of seconds. You will now have moved under your own power. At least you can log the time.
Depends how long you spend programming the route into the G1000 with the engine running
Not long - the first couple of waypoints and the destination is the most I would ever do on the ground. At least in the US, you almost certainly won't fly what you filed anyway. So entering half a dozen or more waypoints is just a waste of time.