I like these in theory, but I think the execution suffers a bit.

These could have been done much better, by basing them off existing Metamagic and Metapsionics; make the feats usable once per encounter (you regain them only when you recover maneuvers between encounters; recovery through a class recovery method, the Adaptive Style feat, or a feat to recover a maneuver does not help).

Then you can get things like:
Enlarge Maneuver [ Metamaneuver ]
You can apply your maneuvers at an extended range.
Prerequisite: One martial maneuver
Benefit: Once per encounter, when you initiate a martial maneuver with a range greater than Melee Attack, you can apply this feat to double its range.
Special: If this feat is applied to a stance, such as Leading the Charge, the stance is initiated as a boost with a duration of one round. You are still considered to be in that stance, however, and so cannot be in another stance (unless you can be in two at once). If range and area are interrelated (as with Ballista Throw or Leading the Charge) you must apply Widen Maneuver to enhance the area along with the range (an Enlarged Ballista Throw would throw the target 120', but would only damage others in the first 60')

Extend Maneuver [ Metamaneuver ]
Your maneuvers can last phenomenally long
Prerequisite: One martial boost
Benefit: Once per encounter, when you initiate a martial maneuver, you may double its duration. A duration of "End of Turn" becomes "One Round," allowing you to benefit from it even when it is not your turn.

Maximize Maneuver [ Metamaneuver ]
You can deliver a maneuver to maximum effect
Prerequisites: Two Martial Strikes from different disciplines, one of which must be 2nd level or higher, two Metamaneuver feats.
Benefit: Once per encounter, when you initiate a martial maneuver that inflicts a random amount of damage, you may use this feat to instead inflict the maximum amount of damage. This does not apply to normal weapon damage.
Special: A mighty, maximized maneuver inflicts maximum damage, plus half of the normal, rolled damage.

Mighty Maneuver [ Metamaneuver ]
You can deliver a maneuver with a mighty blow.
Prerequisite: One martial strike, any other Metamaneuver feat.
Benefit: Once per encounter, when you initiate a martial maneuver that inflicts damage, you may use this feat to multiply all variable damage inflicted by 1.5. Do not multiply normal weapon damage, even if the maneuver also inflicts normal weapon damage.
Special: A mighty, maximized maneuver inflicts maximum damage, plus half of the normal, rolled damage.

Quicken Maneuver [ Metamaneuver ]
Prerequisite: Four martial strikes, three other Metamaneuver feats.
Benefit: Once per encounter, when you initiate a martial strike with an initiation action of one standard action that requires that you make a melee attack, you may make all extra attacks granted by sources such as feats, Haste, or a high base attack bonus. The strike provides no special benefits to your additional attacks. Initiating a maneuver this way is a full-round action.

Widen Maneuver [ Metamaneuver ]
Prerequisite: Three martial strikes, Enlarge Maneuver, one other Metamaneuver feat.
Benefit: Once per encounter, when you initiate a martial maneuver with an area of effect greater than your melee reach, you may increase all dimensions of its area of effect, except line width, by 100%.
Special: In some cases (such as when range and area are interrelated), you must apply both this feat and Enlarge Maneuver to benefit from this feat.