Supposing that there will be no classes and the omniframe will be modular:
What if different omniframe modules changed the ways your character could move?
Glider could be a back/shoulder module
Jetpack could be both back/shoulder and leg, so you can choose any of those to be your jetpack
Grappling hooks on Arms modules
Leg modules could also include dashing, double jumping, walking on vertical surfaces, or even jetskating (megaman legends style)
Players who like being airborne could specialize their frames to stay on air as much as possible, while players who prefer to stay in solid land could have greater speed and maybe dash arround by sacrificing their aerial capacities.
What if different omniframe modules changed the ways your character could move?
Glider could be a back/shoulder module
Jetpack could be both back/shoulder and leg, so you can choose any of those to be your jetpack
Grappling hooks on Arms modules
Leg modules could also include dashing, double jumping, walking on vertical surfaces, or even jetskating (megaman legends style)
Players who like being airborne could specialize their frames to stay on air as much as possible, while players who prefer to stay in solid land could have greater speed and maybe dash arround by sacrificing their aerial capacities.