I'd like an option to disable TNT duping.
Wither cages, along with pushable dispensers and renewable sand from carpet extra, make it far less necessary.

I would also like tnt duping to be removed from the game but this quirk is totally voluntary - you can use regular tnt and dispensers if you want instead. Tnt duping requires a special setup that you don't have to build if you don't want to.

I mostly agree with that viewpoint, but I still think a patch could be useful to enforce a server ban on TNT duping.
It would also take away the temptation of TNT duping : P