RE: knock travel
Nock travel can really only be studied properly through specialized test equipment. Even with the usage of draw stops, it can be difficult to get what you demand. When I say "...get what you demand.", I'm referring to specialized tuning required by some tournament shooters for their specific shooting form. This can be done with as little as 1/2 to 1 twist in one or the other cable.
Two cam bows utilizing synthetic cable systems with a split yoke can be easily adjusted to fit a shooter's needs. The Darton C/P/S and Hoyt Cam and 1/2 or Spiral Cam and 1/2 give effective straight and level nock travel.
Typical one cam bows are not adjustable. What you've got is basically all that you get. This is not a disaster unless you don't know how to work with the tuning idiosyncracies that sometimes arise. Some of the newer typical one cam bows have timing marks. Utilizing these marks will make your bow perform better in several ways.
If all manufacturers would put timing marks on all cams (one or 1 1/2 or two), it would eliminate a lot of guess work involved in the tuning process. It would also help considerably when a customer comes in with a broken string or cable. Imagine trying to work on a car engine without timing marks on the cam. You'll eventually get it right, but it will be hit and miss for a while.