Yes the clutches on these trucks suck IMO. They do grab way too high. If your still using the stock clutch, seriously, get a new clutch(Centerforce or equivellent), and MOST IMPORTANTLY, do the viper hydrolics upgrade. This in itself will compliment the B&M, and honestly, the entire clutch system will feel 10000% better than it does now. I have said it many times before and I am starting to sound like a broken record, but the hydros upgrade is the single most important mod you can do. You will get your power to the ground faster and massively more efficiently. If your stock clutch is still grabbing strong, I guess you can wait on the clutch. If your stock clutch feel spongy, or doesnt give you a good "Yank" every time you let out hard, by all means buy a good clutch. But, do the hydrolics upgrade NOW. Dont even question my advice, JUST DO IT. You will not be sorry.
You will pick up half a second at the track going from a spongy stocker to a new Centerforce with hydros upgrade guaranteed.
On the shifter, do what 505 said, otherwise do the clutch/hyros, and the shifter will magically feel like it should.