Hey this is an awesome mod, really looking forward to the new version. I was wondering if there is any compatibility with the PR lights mod? On my version the lights seem to work, however only 1 of the units in a particular group have the edited lights. For example only engine 1 will have the edited lights and engines 2 and 3 will have the regular lights.
Its not directly compatible. As you have found out it will do Engine 1, for example, but not 2 or 3. You would have to ask CFD if he would update his project to be compatible.
To answer your question, the reason is because C.F.D never modded Shane's Submod Lights. So that's why your having these problems.