Balance issues with the current system
In the current move, you have one move action and one standard action per turn, plus unlimited free actions. That causes the following set of game balance issues:
Firearms are overall now much better relative to bows/crossbows, because reload time is no longer a significant penalty
Many skills become nearly pointless, because they offer only single attacks and the default is now full attacks
Knock down effects are much less useful, because enemies recover immediately from prone
Skills that stun the enemy party each round (like Returning Storm) make the game trivially easy, because stun lasts the entire round
Instant speed skills, like evasive fire or many wizard buffs, can be used infinitely in each round; at mid-to-endgame, this makes combat trivially simple, because you can (for example) trigger evasive fire 8+ times at the start of combat and wipe out entire enemy groups.
A simple solution
My proposal would address nearly all of these issues to some degree, and completely address most of them. Simply put, I suggest adding a third type of action per turn, a 'free' action, which would interact with each of the above systems. Some of these fixes are simple:
Reloading consumes your 'free' action
Getting up from prone consumes your 'free' action
Each 'instant' speed skill consumes your free action, limiting you to one buff/Evasive Fire/etc. per round
Getting stunned consumes actions based on the duration of stun in RTWP. A 2 second stun would consume only your free action, a 4 second stun would consume your free and move action, and only a 6 second stun would consume all three actions.
The fix to full/partial attacks is more complex:
Making an attack consumes a standard action, as normal; however, this only is a partial, not a full attack
However, if you have your free action remaining, you can instead make a full attack instead of a partial attack, at the cost of consuming your free action.
What this proposal doesn't fix
Dexterity and attack speed bonuses being relatively less useful than in RTWP I'd love to hear your thoughts!