People should be actually able to buy stuff from vending machines with their credits or morph points.
Like:
Energy drinks (increase speed, stamina).
Junk food (humans - act as extra (weak) medkits, aliens - temporarily accelerate regeneration).
Sweets (make the enemy players lose control and go towards them when they see them).
Science magazines (temporarily add extra personal momentum to the buyer's momentum bar on top of the team's momentum).