the problem with locking tuners is located at the nut: the friction in the groves of the nut is the cause of the strings'detuning. It might help not to get way out of tune, but you won't be perfectly in tune when you come back. The same problem is located at the saddles, same causes, same effects. That's why we have "double" locking trems, where the string is held at both of its vibrating ends. If you want to really dive bomb, get a floyd, only Jimi could stay in tune doing that...