First off, loving this mod so far. Very enjoyable and adds a new level of immersion.
Only thing that doesn't make sense to me, is having to hold the F key to leave the engine running.
Would it not make more sense to have it as a single press to leave running for traffic stops etc?
Long press to shut it down if you're pulling up on scene and you know you'll be away from the vehicle for a while.
Or just remove the long press altogether and shut it down with the separate engine key if required.
I use fast draw script and it clashes when holding F, as it draws the pistol every time I get out for a traffic stop.
Just a thought.