Interesting idea, really. Problem is - AI will never be able to use it. And AI SHOULD NOT be able. Xcom principe can be ruined with such thing.
When writing it, i get in mind another cool idea, possible letal for gameplay: once i make a typo and give movementtype: 5 to unit.
This unit can move, but lose no TU and, what is most important, became able to move through walls.
So, if possible to fix TU spending, we can begin creating our own army of ghosts.