There is for gtx 1000 series. i dont know the tool but t-rex and phoenix has command for that
He means a tool only for the timings and not the memory tweak commands, but you are right - many miner have the --mt commandline argument
only for the old nvidia 10x0 cards (nbminer, trex, phoenix)
I don´t know why no one made something for newer vram like gddr6 and gddr6x, maybe it is not so easy or not needed.