The only real reason why you would ever adjust your TPS is if it's out of allignment, or if you get a new TB that requires you to use your old TPS. Much of the time when you install a new ECU in your car that wasn't originally designed for it, for example and OBD1 P28 ecu that many people use, is often a different power supply, and can sometimes depending on the power offset can set your TPS sensor off very slightly, just enough to change the TPS voltage to where the idle either fluctuates, or the low idle fuel cutoff routines don't work.

In any case, it's not something you'll likely ever worry about, just as long as the TPS is at about .50-.51 volts, it's fine. If you ever do need to screw with it, I think the replacement allan jey screws are a 6mm, and surprisingly enough are sold at Lowes which is where I found them and I think also Home Depot.

As far as idle goes, the purpose for Vtec, is drivability, and even with the most aggresive cams, you ussualy don't affect the idle too much. In any case, good luck

Later,
Aj