do you guys realize even if you were to force shaders there would still be easy ways to re-write the shader script so that there was no darkness?
and we would probably have patches to enable the non shader mode for clients who can't handle it
disabling shaders would just forget a large portion of users and cause disagreements over modding the game so that these people can actually play the game they've been playing
as for a client mod theres no way to ensure that the user doens't mod the client
it's a silly arms race that there is no point in fighting