Dunno if you can do that. As far as I know, you will need a new clutch for a stiffer engage. Adjusting it I think is only for maximizing the shifting ability of the clutch you have. There is a turtorial on it in the FAQ section of 240sx club.
http://www.240sx.org/faq/index.html The left side has the topics listed alphabetically. I also couldn't figure out the CC. I don't have a manual so that probably didn't help. I figured out that you have to hit a combination of two buttons. Set, then Accel or something, can't remember now. I only used it once. Double tap it, or try various combinations. Make sure you let off the gas enough for the computer to catch back up to speed. You may be doing it right, and not giving the computer time to work. Since I don't have the manual I can't tell you the specifics about it. All I know is that I have to hit the CC On button, then a combination of two buttons on the steering wheel. I've only tried it in 5th, that may or may not have a bearing. PEACE. Tek.