Why discount par? It an inseperable part of golf. In the future, courses will have par 4's and 5's. That we have got used to the rediculous "every hole is par 3" concept, is one setback to the progress of the game. It will happen though, look at the USDGC.
It's true that good par 4's and 5's are harder holes to design. They should not be just a matter of length. When done right, these holes introduce a better scoring variety. You have some great examples of par 4's in KC. At Ted's Dread, holes 1, 3, 11 (long tee), 14, 15, and 18 (long tee/pin). Several at Blue Valley as well.
There is a lot of good information already written about par concepts. The par document mentioned shows 4 different "levels" of play. Gold is 1000 rated golf. Blue is 950. Red 900. White 850. While the game needs a professional standard, thus the use of gold level for the courses "scratch scoring averages", you can see how using a standard for course par or hole par that is closer to your levlel of play would make the terms "birdie" or "par" more relevant to each of us.