For the cheap price of carcode, and the amount you actually use it, can't beat it IMO.
The secret to keeping it fast is to turn off all the reads that it CAN do, when you don't need it to do it. That way its only updating the feeds that you are currently monitoring, instead of over 100 that you aren't reading. Or perhaps a faster laptop will help too.
Absolutely can turn off each cylinder.
It is kind of interesting how it can command this. It must not close the pressure building part in the IP so when that cylinder is filled, it never closes to build pressure to pop the injector open? Not sure. It can't modify the engine internal, nor the injector, so the only thing it has access to is the PMD signal to the IP, which controlls the pulse of fuel, so maybe it doesn't allow any fuel for that cylinder on command? I don't remember if it smokes any more with cylinder commanded dead or not. Don't think so.
I'm happy with it.
I have 3 Delphi and 5 Bosch Injectors Kenny for about 25,000 miles now. Long story how it came to be, but it is what it is. Since they are mechanical units sets completely individual of each other, I can't see how it makes a difference.