There are a number of monsters that have attack powers or features that deal extra damage to targets under certain conditions, similar to sneak attack (extra damage with combat advantage) or other conditions (eg: extra damage against prone targets).
Consider the Doppelganger Sneak:
Short Sword (weapon) At-Will
Attack: Melee 1 (one creature); +8 vs. AC
Hit: 1d6 + 6 damage, or 2d6 + 6 if the doppelganger has combat advantage against the target.
Or the Kobold Slink:
The kobold slink deals an extra 1d6 damage on melee and ranged attacks against any target it has combat advantage against.
The creature can’t take actions voluntarily. Instead, the dominator chooses a single action for the creature to take on the creature’s turn: a standard, a move, a minor, or a free action. The only powers and other game features that the dominator can make the creature use are ones that can be used at will, such as at-will powers. For example, anything that is limited to being used only once per encounter or once per day does not qualify.
The creature grants combat advantage.
If either of these creatures, or others like them, are dominated, they are granting combat advantage to all creatures (that can see them), including themselves. If forced to attack themselves, would they incur the extra damage from their attack or combat features?
Likewise, the Dire Wolf has:
Attack: Melee 1 (one creature); +10 vs. AC
Hit: 2d8 + 4 damage, or 3d8 + 4 against a prone target. The target falls prone if the wolf has combat advantage against it.
If a Dire Wolf is dominated and prone and forced to bite itself, does it deal the extra damage for biting a prone target?
This probably wouldn't work on features limited to once per round, such as Tikulti's
Once per round, Tikulti deals 2d8 extra damage against a target that grants combat advantage to him.
because the wording for domination says they can only be features used at-will... and I'm assuming that "once per round" is a limit that doesn't inherently apply to at-wills.
Note that this wouldn't apply to a player Rogue, because the Rogue class feature only works when attacking enemies:
When you make an attack with a light blade, a hand crossbow, a shortbow, or a sling and hit an enemy granting combat advantage to you, that enemy takes extra damage based on your level (see the Sneak Attack table). You can deal this extra damage only once per turn.
I noticed that some monsters use this wording on their sneak attack feature, so they also wouldn't sneak attack themselves. Perhaps all monsters should have their sneak attack or similar features houseruled to only apply to enemies?