Creating a Maneuver system can limit the effective choices a player can make in a combat situation. If a player chooses a specific maneuver, they are unlikely to attempt one they do not have access to. So I would like to propose a system where combat accuracy increase at a much faster rate than currently. Keep in mind this system must assume AC does not increase, much as it is in the current play packet.
Damage Bonus-For every 5 over AC the attack gain +1[W] damage. natural 20 gains +1[W]
Special Attacks-if a character wishes to apply a condition against a target (Prone, Stun, etc.) they take -5 to attack roll. Damage bonus still applies.
Multiple Attacks-if a character wishes to attack multiple targets then a -2 per target is applied to each attack roll. Once the attacker misses a target the attack stops. Example: if you attack 3 targets, each d20 is at -6. If you miss the second target, you do not roll to attack the third.
Fighter gains +1 attack per level
Rogue and Cleric +2 per 3 levels
Wizard +1 per 4 levels
This opens up all classes to be able to Cleave, Trip, Stun and gain extra melee damage in a simple way but gives clear advantage to the Fighter. Certain feats can eliminate the penalty to specific maneuvers.
Disclaimer: Wizards of the Coast is not responsible for the consequences of any failed saving throw, including but not limited to petrification, poison, death magic, dragon breath, spells, or vorpal sword-related decapitations.