I'm not sure if this has gone unnoticed, but this is well worth looking at a bit more..
By default, Imp prevents the use of Magitek.. which is meh. However, you can screw around with that when Umaro is around.
Umaro automatically selects an offensive M-Tek command by default.. which sounds right until Imp is applied.
What then happens is that Umaro operates "normally"... with his normal skill set, instead of attempting to select another M-Tek command.
This also allows you to have Gogo Mimic a physical attack that Umaro does..
Fun stuff.
Also note that with only the use of hacks, the M-Tek status is removed after the end of the battle when M-Tek status protection is available...

Here are some movies to go with what I'm saying:
This uses the FF3USHT 1.3g beta hack.
http://rapidshare.com/files/141147815/FF3Hack3.7z.htmlThis uses the Enternal Crystals hack (I didn't include the patch this time, just go get it yourself from RHDN).
http://rapidshare.com/files/141147916/FF3Hack4.7z.htmlThe second movie is better since you see all of Umaro's standard commands in action. The fact that both use hacks is irrelevent since I'm pretty sure you can reproduce this on the original. I do wonder though if this behavior is fixed in FF6A...