Actros MP3 reverse gear should stay inside

Hello guys I got a few additional reversing lamps mounted on my Actros Mp3 from the company. Unfortunately they have connected it so that they only glow when the reverse gear is in. No toss. Switch. But if I have to unload somewhere in the dark, I also want to see something when unloading and not only when driving backwards. The Actros switches back into neutral after a certain time, if I leave the reverse gear in it. So that’s not how it works. a tip? Can you somehow leave the reverse gear in it? Or does it only help to wire differently? Thanks and greetings