What could be, when I think about it, is that eventually only string-variables works. Try to make a string-variable and then, if the string-variable does contain for example On, the script activates another variable.
Like this: (It could be some errors, it is just to show you, I wrote it on the mobile phone)
Yes it is possible. You just have to put a $ before the variable and it will get visible. Then you can use it as normal
I cant answer questions 2 and 3, because i dont really know anything about that. But for your first question, the answer is easy. At this point the triggers only can be used for the switches and not for the traffic lights, but I think that will come not too far away.
Is it really so hard to retexture? Only mark everything on each texture and just change. Tne dds and bmp textures can be the same as the others
