Yudishtira
Spiritual/Creative
Not until the Neuralyzer tech...BUG/PROBLEM:
Hmm can we have a function build into mod to remove a promotion from a unit? Like you move the unit into a city and then you can kill a promotion you dont want to have that unit anymore?

But seriously, realisticly most promos, since they represent training, should not be removable (without mindwiping). Ones that represent "doctrines" (none spring to mind) it is fair enough to remove.