An Item based skill system would work great for the regular game and will help add to the classes in league. I was thinking along the lines of items you can pick up to gain special abilities like ground pound, electric pulse, sprint, poison or ice pulse to slow opponents, heal burst for healing self or teamates ect. all of which could use substantial amounts of stamina; or modifiers like faster health recharge, stamina boosters, faster fire rate, quick reload, ect. Modifiers could even come at a cost like faster fire rate takes away from reload rate to keep players from having an advantage. Some of these abilities could come from killstreaks/as items on the map/ or as a selectable perk. I dont think the abilities should be better than shooting the guns, but would add nice variation to the playstyles available in the game.
If all this seems like too much, let me make a simpler suggestion. I think after a super jump, you should be able to use the remaining 50% of your stamina on a ground pound.
Post any special abilities or modifiers you can think of and lets try to get a realistic list and see if anyone is interested in making this idea happen.