There is not going to be any payload installation at the pad any time soon.... I ended up buying a big battle just to
show the payloads there...
As for lights, the forgotten SSV_XenonLights vessel has 2 modes: fixed or tracking the a target.
If the scenario parameter "PAN_TILT <pan> <tilt>" is present, it will be fixed in that direction. Without that parameter, it should search for the vehicle (max range 1km) and turn to it.
They would probably have 2 or 3 lights near the VAB, darkness for the most part, and then a few more at the pad.