One of my players asked me why there were no cybernetics that increased Cunning, Presence, or Willpower.
While it's obvious how a brain implant might improve one's Intellect, I don't find it unreasonable that other implants might increase the other three - they are far more mental than physical.
For example:
CYBERNETIC BRAIN IMPLANT (MOD VII I, MOD X, MOD XI, AND MOD XII)
Mod VIII cybernetic brain implants provide +1 Intelligence. Mod X cybernetic brain implants provide +1 Cunning. Mod XI cybernetic brain implants provide +1 Willpower. Mod XII cybernetic brain implants provide +1 Presence. All cybernetic brain implants come with a comlink and a computer access link. Only one cybernetic brain implant may be installed.