Buds. I will share some of my crazy ideas as well ;D.
I felt that there should be more numerical points representing a single AP. For instance, instead of base 4 AP, have 40 AP. That way you could fine tune some of the skill's a bit more, where your basic attack is 20 AP(it would be cool to have some sort of skills and/or magic which could reduce that cost to 19,18, ect. with the excess being carried over into consecutive rounds) and your Battle Stop is, say, 24 AP. That way you wouldn't be able to gimp the armour and cc on the same move, without manipulating the environment first, that is. It could allow for additional weapon diversity and greater balance between weapon types, where faster weapons could make more attacks during the whole of the combat for less damage and heavier weapons less number of attacks for greater, more focused damage.
Source could work the same way. Instead of 3 points of source, have a source bar. Reduce the total amount of source available to(I am just totally speculating here) the equal of 1,5 SP and have the more costly SP skills put your characters into some sort of state for the duration of next turn(or few), because they lacked the additional source. You could also add some flavourful mechanics to this by allowing your sourcerors to become overcharged with source for a few turns, either by sucking source out from the rest of the party members, or have them donate it to the said sourceror. Make a selection of initial source skills(maybe race/class dependant), one per character, from which you can choose and reduce the cost of those to the equal of 0,75 SP. Reduce the total number of available source in the game(puddles, creatures, ghosts, orbs) and voilà.
