1. I have read strong accounts that Pastels are both the friendliest, and also other strong accounts that they are the hissiest/strikiest. Thoughts?
That probably because pastels are by far the most common morph out there and people are making a few animals speak for all.

2. Spiders and normals I have heard documented as generally friendly.
Being a little slow can help with that

3. Cinnamons/supers I have heard documented as having ill-tempered tendencies.
I've never met an ill tempered one besides at BHB lol.

4. I have heard whispers of a “white snake rule,” and it was mentioned by snakebytes - that white snakes tend to be friendly and docile (albino, lucy, ivory etc.). I in particular care about this one as I am very interested in an Ivory or BEL when the time comes.
While its cute that Brian has that happen in his collection, I'm sure you can find many accounts of just the opposite. Personally I find it rare to have an ill tempered ball python, no matter what morph.

So yea I'm with the individual animal crowd also.