I'm using GitFlow, and it sure seems like it would be a more intuitive ordering of the lines in the graph in SourceTree if the left-most line were always 'master', after that any 'hotfix' branches, then the 'release' branch (if present), then 'develop', followed (right-most) by any 'feature' branches.
I know this is a trivial benefit that would probably require significantly complicated programming on Atlassian's part and is therefore probably not worth the effort. However, it would be awfully nice, so it seemed worth asking just in case there is already some way to achieve this result (or something similar).