I'm currently playing a 20 Body plus 20 Cool Solo - working on Reflexes - at 80 hours play time (helluva lot more with reloads and such) and I don't feel Cool does anything more for dialogue than any other Ability / Attribute. I'm very much looking forward to my own Netrunner Build, where I'll prioritise Intelligence, and either Tech or Reflexes in secondary (probably Reflexes followed by Tech and keep them pretty neck and neck)