I accidentally destroyed the car key while messing with the code, so I edited the mod files to have a hotwire option.

It worked on my solo map, so if anyone really wants to have this option I made a guide on how to edit the files for it to work. Be warned that I didn't test it all that much it simply worked for me.
Instructions on pastebin:
https://pastebin.com/H0mTRSmS

I feel that it becomes too easy when you can hotwire any car, but it isn't all that hard to do it in real life so I guess it can be added if there are some risks involved.

If anyone is interested I would gladly explain how my edit works and discuss how we can balance it.