I think the "technical" reference was just the powerline that bypasses part of the Gray Creek route. It's often open sooner than the actual road as it doe not go quite as high, but the riding is much more interesting (and doable for a well-ridden big duallie).
I did Rose Pass twice last summer... only one tough (but short) climb, but would not recommend it as part of the main route given that we are targeting bigger bikes for this. But certainly could be an interesting alternative for smaller bikes. Should not be attempted before July as the St Mary river crossing can be pretty high and fast with spring run-off.
The route I suggested to Deadly99 for getting across the divide was Deadmans Pass. It is the first pass to the north of Coleman and is a nicer alternative to hwy 3
Koko Claims (also called Crossing Creek) is way too tough for the bigger bikes, but not a problem for a 650 or smaller thumper with a really good bash plate. Very loose baby head rock climb that seems to go on forever... but fun.
The route I suggested coming down from Canal Flats is the power line that runs just to the west of the hwy. It's a blast for high speed DS riding that is fine for all bikes.
Also the ride up to the Skookumchuk LO is not to be missed - great views of the valley.