So, have you ever found a mech that was DNA locked by some traitor, or someone who has cryo'd, or any other number of things, and now you can't get into it again? The only real way to deal with it, I think, is to break the mech down...a huge waste of resources.
So my suggestion here is a Mech Lock Breaker, a device that functions somewhat similarly to the Pod Lock Breaker. It is an object that would spawn in the Robotics Lab, and when used on a mech that has had it's maintenance panel unlocked (with the proper ID), would allow the user to wipe all access, including DNA locks, from the mech after a period of time (10-15 seconds). This would allow Robotics to recover mechs, from the basic mining and combat mechs, to the rarer Phazons and service mechs without having to waste resources. Of course, this kind of maneuver would be blocked by any mobile mech, and would definitely not work in combat.
As it stands, I'm not sure how the pod lock breaker works, though I can guess it is less involved than this. Please let me know what you think, and add any constructive comments you would like!