Ok first of all Skulfuk it is a bug because for example put shader inverted shader and then quickly change to the other it will still be the same lightning...
Going around the discussion of weather it is a bug or not - maybe a "Shader affects only background" option would "solve" this?
Possibly, but you can make shaders that don't cast horrid lighting everywhere & mess things up blah blah (have people read anything I've wrote?). It's sorta like using a brick to tickle someone.
I will rape the notepad today and check all possibilities to find out what actually makes the force color change.
Anyway, that thing puts limits on shader makers. Shader has a huge weight in videos, so it put limits on video makers also, which is even more important if Tb Creators really care of Toribash promotion. So Skulfuk if you have better contacts with people from the toribash technical side then it would be extremely cool if you would let them know about it anyway - maybe they could lift the limits or clearlier explain the reason of that shit.