Just got finished playing a few games as skulk and I had this idea. What about instead of just getting res for kills if instead you "stole" the res from the players pres when you killed them.
I felt like a few times I did really well to get away alive as a skulk but there wasn't any reward for it. By the time I ran all the way back to the hive and healed I may as well just have just gotten killed and respawned. If you lost a little res when you died then there would be an incentive for staying alive rather than going on suicide missions. (I'd like to here other ideas for incentives for staying alive too. I really feel like there should be some reward for staying alive as a skulk. [Another idea would be to link spawns to team res so that every spawn costs a few team res])
It would also mean that there wouldn't be any "free spawns" so to speak. At the moment if you spawn as a skulk or a rifle marine, you can get killed without any penalty. Aliens tend to target the marines with shotguns and flamethrowers more because they know that those weapons cost money. It would be nice if killing rifle marines and skulks also did a little bit of damage to the enemy economy.
It would only be 1-2 res per death (I guess you could get different amounts based on weapons/classes) so it wouldn't heavily skew the game in favour of whoever is getting the most kills, but it would make people try and stay alive more and reward players who avoid death.
[EDIT] Actually, I think adding a health regen for skulks might be a better idea to reward them for staying alive. See below.
Also just while I'm posting this, here are a few ideas I had for alien upgrades:
Restore energy on kill (same as frenzy only energy instead of health). Allow hives and crags to restore energy as well as health. Increase energy restoration while not moving (to allow skulks to hide and restore energy faster). Increase health restoration while not moving.