I have custom framing job coming up that has crown molding at the eaves and rakes, and the eaves wrap around onto the gable walls and return. The return is a hip roof. I'm not too familiar with this detail... I think I've done this maybe 3 times overall, and it's been a long time since the last one.

Couple of questions:

Does crown molding have a "typical" spring angle? Iow, don't most crown moldings lie at about X degrees?
If you wanted to, couldn't you adjust that angle to "force" the crown to lie, say, square to the roof plane?

I'm in the process of doing some shop drawings, mainly so I can see for myself how the crown will affect the heel height of the trusses, because the house has different roof pitches. I also want to be able to look at a detailed drawing so I can decide how this will all go together, and in what order. (iow, does the crown have to be installed before the roof goes on... think: drip edge overlapping the top edge of the crown... "rake" crown dying onto the hip roof returns...)

Thanks for any advice, tips, etc!