Group loop, is it difficult to add?

This is a serious question as I have very limited knowledge of programming.

I see lots of posts about being able to loop a group of clips for playout and the answer is usually that there is a way to fake it but not a supported way.

What would it take to actually build a proper way of doing this into client 2.0.9?

Is the reason this hasn't been done because
  1. It's really hard
  2. SVT don't need this feature so, understandably, won't develop it
  3. It's not possible