Sorry, i dont think you could ever make something better that Retro.
Retro, even though you say lacks, was more about someone actually getting up and doing it, other than saying "TS Beta was good, i hate EA" etc.
You gotta stop looking at Retro from a modders point of view, play it to enjoy it, and see TS in a different light. If you cant do that, remove it, you loose.
Creagor is right though, Tiberian Odyssey and Tiberian Sun : Recoil both take huge inspiration from Retro, it was the main reason we started Recoil way back, it was Retro but in the future

BTW, WTF is "Tiberian Sun: Genesis"?