Disallowing a unit to move (and still allow it to move...is it possible?)

Is it? I'm redoing a coding system I made ages ago in GUI back when I was a scripting newb and part of the code requires a unit to unload all of its units if it runs out of mana. However, doing it automatically requires some ugly and inefficient scripting, and I figure it wouldn't hurt if it allowed you to do it manually. However, is it possible to freeze a unit to still allow you to order unloads, while forcing it to not move?

==Edit==

Gah, typo in my title. Hope I didn't goof anyone up with the moronic "Disallowing a unit to move and still allow it to move". I mean I want it to not be able to move but still take orders for close range no-movement-required orders.

Just register whenever the unit is ordered a target order, check if the order was move,patrol, whtaever you want tro disallow, pause the unit order the unit to stop unpause (maybe with a 0.00 second timer, test it out).
Should work.

Timer not needed if you pause.

There are some "special" oreders where you need it. Look at Vexorian's Indipendant Summons.