Improving firefight

I really enjoy everything this game has to offer. I especially appreciate it’s take on firefight, arguably the best firefights we have seen since halo reach.

But I feel like some some changes and additions would make it better.

Skulls:
Something I have been really bummed since firefight released is that the skulls can’t be used.
Now it would be cool to actually see it how it was in ODST/reach with addition of skulls every set. Or use them in private games.

Waves:
Each set has a random leader already, I want to see more of those leader specific units.
More variety of enemies abilities, maybe waves where the AI has leader powers. The gamemode is already hard, so that might make it too hard.

Bonus waves:
Reinforcements should drop with the upgrades the player already has.

Reinforcements give extra pop?

Units can gain more then 3 (max of 6?) stars with the exception of the veterancy bonus wave?

I want dlc units as enemies.