Neat ideas. I like lots of them, but have questions/concerns about several.
Does Phantom telefrag? Are you meant to telefrag to get the Pro effect, or is it just get X number of frags from the time you pick this perk?
Armorer and Ogre seem far better than slipgater, which seems like it would be hard to use to much effect.
Immortal has the potential for abuse, since players can just suicide into lava/slime in some levels any time they're about to die, to deny the enemy a frag and keep their stuff (though they lose a frag in the process without pro, it's often worth it).
Cannibal: How much HP is each gib worth? And does the player get the Pro effect from every gib on touch, or does he have to walk up and use an action to consume? 150 HP per gib seems amazing to me.
Stalker: I can imagine this being handy for silencing jumps, landing sounds, and a few other sounds, but unless the player is modified to make footstep noises normally, this may be underpowered in Quake.
Fiend could be very annoying, since perpetually bunnyhopping players are aggravating as it is.
Elemental has the potential to be a very bad feat without a certain fix. Slime and lava are often meant to be lethal, so a player can get completely stuck and forced to use the kill command. If he has some way to teleport to a spawn point after 10 seconds in slime/lava, then that fixes the problem.
How do fragstreaks and deathstreaks work? Are they automatic for any character that has a killing spree or death spree of x? Or does the player pick the perk, which becomes available once he's gotten that high of a streak?
Sorry for all the questions and nitpicks. I actually do like the idea, and I don't mean to come off negative.

When my computer inevitably explodes and kills me, my cat inherits everything I own. He may be the only one capable of continuing my work.