I have been reading this thread on flaps and nobody has mentioned one extremely important factor. The first ride I had in a KR, Dan Diehl gave me a ride in Bob Passmore's KR2 which had the standard flaps. Dan made a special point to show me the differance in approach attitude with and without flaps. The most important factor in using the "stock" flaps according to Dan was that they lower the nose so that you can see where you are going to land. I was convinced by his demonstration and I've built stock KR2 flaps on my KR2. When they are deployed the nose drops considerably and the plane slows down, both neat features to have available.
YMMV! Regards, Bob Lee N52BL KR2 Suwanee, GA 91% done only 65% to go!