he also said it's unlikely to be added because a big fraction of the community must show interest in something before it getting done, from what I understand

I agree that the gamemode you suggested would be fun but for now that's just you, and you can use the disable ghost feature yourself. I'm totally supporting your idea because I dont see any way it could harm the players experience (if it's a toggleable feature, as ed exemplified) and it sounds fun, but I think you should complement it with more features first, instead of being this especific you could propose an entirely new gamemode with different gameplay experiences and such.

Anyway, I'm still supporting this gamemode idea