The best use I found for domination is to get a sorcerer NPC to shrink/enlarge items.
Here's my caveat though: Hellions are pure ego, and talk about having the biggest dick. As it stands they're really nothing better than a 2nd row support class. Personally I'd rather be in favor of them losing domination altogether in support of something else. It's a far easier choice for the player of hellions to join the Midnight Council or Black Hand for a beefy trib NPC over the Crucible. Especially if you're a player that wants to do solo PK. You can't run around in the front row as a hellion like an [REDACTED], and that is just really disappointing. I mean with all the blustering of giving hellions the parry skill, it really didn't help at all.
They get heavy armor, they get tank skills, but they just can't do it. It's sad. Poor hellions.
And no I'm not advocating that they get sanctuary, or armor. I just wish they got a skill called rescue.
But then I have successfully argued against myself with that, which is why I've never posted it up until now.