This is more speculation than knowledge, but to me it seems as if gamestudio makes only a very small part of conitecs business and is more some kind of hobby of jcl, which means that he will develop the engine as long as he kinda enjoys it and that he will prefer to implement features he enjoys writing, which are usually small and easy to implement things.

Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en)
Shader Tutorial (ger)

http://www.slindev.com