I'd like to have a way to completely disable the +RTS flag so that a ghc-compiled binary does not eat it, but keeps it in argv/getArgs instead.

This is needed whenever you try to make a program that's supposed to pass on all arguments, for example something like ccache or pid1. As you can imagine, swallowing +RTS argument's isn't great when you want to pass them on to a Haskell program.