There were two such mods. But due to errors in them, I offer you my version.
I - on / off the engine. The radio will not disappear and you can continue listening to it.
L - on / off headlights.
O - lock/unlock doors. When closing, a "negative" sound will be heard (how to drive into the paint shop in a police car), and when opened, a "positive" sound (how to pass a checkpoint).
Version 2.0 - Fixed all crashes and memory leaks. My cant. - Now the player can lock / open not only the vehicle in which he sits, but also the last vehicle in which he sat. Those. get out of your vehicle first and then lock it up so no one can steal it. After that, you can open it again and continue to travel.