Sounds like that could be used to either grief your team, or separate the AV from it's mob (in the case of Dr. Vahz in the Posi #2 tf).
Either way, ignoring the weird bugs of the Keyes trial for the moment, the issue really doesn't come up often enough to need such a function. And for any mob under AV class, there are other ways around that, such as PBAoE's and knockback abilities.
Now and then a NPC gets stuck. Lately with AM in Keyes and we failed to complete the trial because of that.
It used to happen a lot more but while much rarer these days, when it happens it is a pain. We could try to talk to a DEV or restart the mission but would it not be better to have a command like:
/unstuck target?
This would give the target a very small teleport a few feet away to avoid misuse by players so that they can go on finishing the task.