Looks like it would be possible with some electrical mods, such as adding a wire from a light that comes on when you want, along with a diode to prevent backflow of electricity. A lot of work for little benefit.
I am pretty sure it can't be done with forscan though. I did the mod allowing the spotlights to stay on regardless of speed, but again it is a wiring mod, not a forscan.
2013 F150 5.0 XLT
2018 F150 3.0 Platinum Ruby Red