I would recommend three things in particular:
-A way to control throttle, putting a slider or diagram of a manual transmission with a stick should work well.
-Change the tread spikes to use a toggle instead of holding the key, many pinkie fingers will thank you.
-The ability to cancel a delivery, we’re kinda stuck with any delivery we accept, accident or not.
Nothing else really comes to mind, I will certainly be watching this project with interest!