Terpster,
I see in the FAA guidance,
AC 90-101A the CG that you refer to.
The 'sample' plate they give, shows quite a few waivers, first off, the different RNP levels, RNP 0.15 at the IAF?!?!?, the angle before final segment (they dont want to admit the FMS would do some sortof turn here), missed approach less than RNP 1, DA of 276, but you must make 4000' by WODVU ??...I know this is an example...but I believe this is the plate for KPDX
Some of the public RNP plates are even better...look at the helo RNP for NY,NY..the entire procedure is over the Hudson, including the MAP, but you go 12.9 miles visual to the helipad...