Only having 3 sort groups wasn't great for my teams, and I think others will tend to agree.. It wasn't terribly difficult to make the sorting more arbitrary, so I went ahead and did it.
I wound up making a general import sorting vim plugin that should work with most languages. The implementation is heavily based on what @derekwyatt had here. I just generalized it a bit
Only having 3 sort groups wasn't great for my teams, and I think others will tend to agree.. It wasn't terribly difficult to make the sorting more arbitrary, so I went ahead and did it.