Yeah honestly if someone wants to use combat expertise go just stand there, that's basically already full defense that hes paying a feat for. Mazel?And if they are doing it with the intention of not attacking that's always been an issue with combat expertise so again I'd say not an issue. Announcing you're going to hit an ogre than approaching the ogre should be enough to gain the benefits. Just announce your intentions. It ain't hard. Hell. It's easier.
How is it easier than:
- if attacking, subtract X from the roll and add X to AC
- if not attacking, the feat does not apply
The feat is contingent to the attack action. It applies when attacking (and until the beginning of your next round), not before. Declaration of intentions is not a thing in Pathfinder.