As Combat Maneuvres seem to be a topic of conversation right now I thought I'd pitch in with something I'm using on my game that works quite well. I only allowed about half the combat maneuvres as default ones, plus 2 they could pick from those that remained. In game if they want to learn any of the other maneuvres they will need to find a teacher and learn them.
In practice this means that for the most part they have all the ones they need for their default (cultural) weapons but if in future they decide to move to some new weapon from outside their cultural background they may not get the full benefit of the weapon without some additional training.
In practice this means that for the most part they have all the ones they need for their default (cultural) weapons but if in future they decide to move to some new weapon from outside their cultural background they may not get the full benefit of the weapon without some additional training.