Both of those already exist..?
Fakelag is beanernet renamed and backtrack exists. Also, saying it's a waste of time for the developers is a huge overstatement.
People buy a lot of clients JUST for the visuals like ESP and such. That's why Vape's GUI got remodeled 2-3 years ago. Vape also prides itself on the customizability, so adding customizability wouldn't do anything bad for the client.