eh maghar... tbh they used technology in wod, but... that was goblin technology... same goes for orcs
dwarfs would be better (both regular and dark iron) but then we would arrive at issue with 4alliance and 1horde race
but if they wont be dicks about it gnomes, mechagnomes, goblins, orcs, maghar and human would be fine to have "balance" and not go down some wild path - like tauren tinker, that would be kinda weird
dwarfs would be better fit than humans but it would be weird to only have one kind of dwarfs, as they both use some technology...
honestly, i think best way if they ever implement tinkers (before adding some more reasonable race to have them) would be to screw the "balance" and go with just goblin/gnome/mechagnome