The Pool
I think this or similar have been mentioned in the past. Re-purposing the pool powers could be used to create some interesting combinations for melee, ranged, or support.
Bonus - Giving credit for pool powers already taken in the primary when selecting from a pool (in the example below,Weave would now have no prerequisite)
Boxing
1
Melee, Light DMG(Smashing), Foe Stun, +Fighting Synergy
Kick
1
Melee, Moderate Dmg(Smash), Foe Knockback, +Fighting Synergy
Jump Kick
2
Melee, Moderate Dmg(Smash), Foe Knockback
Adrenal Booster
6
Self, +To Hit, +Recharge, +Damage
Air Superiority
8
Melee, Moderate DMG(Smash), Foe -Fly
Wall of Force
12
Ranged Cone, Moderate DMG(Psionic/Smash), Foe Knockdown
Cross Punch
18
Melee (Cone), Moderate DMG (Smashing), Foe Knockdown, Stun, +Fighting Synergy
Spring Attack
26
PBAoE, Moderate Dmg(Smash), Foe Knockback
Burnout
32
Recharge Primary/Secondary Powers