Everybody running around with thruster and double-jump would get annoying quickly, much more so than sprint IMO. Just ditch spawning with A.A.'s, bring back a refreshed equipment model from Halo 3.
I would like to see equipment re-introduced in a future Halo title as so. They respawn on maps every 2 minutes or accordingly to their effectiveness.
Jet Pack- 15 seconds and it's fuel depleted.
Bubble Shield- 20 seconds and can be destroyed. Objective and Big Team games only
Hard Light Shield- 15 seconds, more appropriate for FFA games
Energy Drain- similar to the one in Halo 3
Medical Kit- 3 seconds, replaces regeneration field, operating animation and immobile while in use. Possible slight damage resistance momentarily after use, to beef it up.
Trip Mine- place mine similar to sticky detonator, use remote to detonate. Can attach to vehicles. Could bring back the Grenade Launcher pro-pipe without being redundant in the weapon sandbox.
Hologram- This one seems good as is.
Vehicle Wrench- ability to repair damaged vehicles.
Power Up (static spawn every 2-3 minutes)-
Camo
Overshield