I think it would be really nice to see the sticky detonator incorporated into the Flood game type.
One possibility is having the last man standing automatically have his pistol changed for the detonator. Another is to just drop a couple down at the beginning of the round.
I dont think I've seen anyone use the hardlight shield in flood. Is there any good way to use it against the flood players? Like most I usually take cloaking. Maybe instead of hardlight shield spartans should get thruster pack.