As others mentioned, the Adrenal Pump is unusable without the SR3 rules they left out of 4. Look them up and adapt them.

There is a third option given that the damage is based upon the length activation, you just need to find a way to turn the sucker off early.
Most SR combats are shorter then 3 turns. If you can just cancel the effects after its important then your all set. I think someone mentioned this earlier that there was a drug in 3rd that let you turn it off. Maybe Dopadrine would work?

I remember what it used to be, a drug called MAO. It let you control it better, but it was still wonky

Besides if I go bringing stuff from 3rd, I'd have to add in all the bad stuff cyber used to do as well. Move by wire basically put you in an assisted care facility.

Well, he chickened out on the pump anyhow-
which is cool with me

maybe i will make an npc that has one and runs around singing "Beserker" from
clerks.