It doesn't take but a couple minutes to do. Screw it out till it stutters then screw it in till it stutters. If you do it, you will see what I mean. find the happy medium. Air screws properly adjusted also helps with starting. And, most of the time, will compensate for mild weather changes. But, if you are happy with it, why bother, I guess?
The windows work for sync'ing as well. That's why they are there. I stick a finger in each carb at the same time and adjust sync by feel. I always check that both slides are going all the way to the top as well.
That's what the cable nuts are for so, yes.