I prefer not to have my words and actions so irrevocably intertwined.
Just because I say I'll press the button shouldn't force me to press the button. I'd rather the words and actions be kept separate, and the actions be done outside of dialogue events.
Well... I think the idea of in-dialogue actions is that they're supposed to be the subset of actions you could potentially perform under those circumstances, in relation to the dialogue (does it end, does it continue, etc.).
I mean, I don't even know how you'd keep something like "*Attack!*" separate from dialogue, as it's merely an indication to the somewhat turn-based nature of the dialogue system that you wish to end the dialogue system and perform some combat related action.
Beyond that, I don't know how you'd manually end dialogue, do something like slap someone in the face, or take something from their hand, then re-engage in dialogue. Or how the game would handle you just deciding that kind of precise action. The regular game controls would have to allow for that; for slapping people or snatching something forcefully from someone's hand, as distinct from a simple melee attack or pickpocketing.
In other words, how do you handle these things in relation to ongoing dialogue, which changes in reaction to both actions AND words, if not via the dialogue system?