Hi Greymark, Caverna has pretty much covered my intent.
- If some scores a critical hit then they also score a combat manoeuvre but the referee might need to consider the relevance to the situation (i.e. some of these manoeuvres are not appropriate for ranged attacks)
- If someone wanted to perform a combat manoeuvre instead of a damage attack then I would personally allow some additional flexibility beyond a melee attack such as using strength (power), agility (speed) or even athletics as the skill check for physical actions and perhaps command or will for the dominate option.