AnotherGuy
Hero
That is fair. I'd certainly allow it - as it would be creative.Most creatures that can inherently self-immolate aren't harmed by doing so.
As for Moonbeam it is nothing like Command. It is wrong to equate the two.
I like the idea of commanding a werewolf to "revert" or "transform". It is a temporary lapse in judgment (if they failed their saving throw).
If a player at my table came up with a creative way to use a spell, that isn't breaking the game or ruining people's fun, I'm not going to disallow it.
If I think the creature may not understand the Command instruction and if I deem that the character may know that, I'd tell the player (so that he make select a different Command) or if there was a chance the character did not know, I'd ask for a Knowledge or Intelligence check and let the dice decide.