Oh I do love Skip.
The only thing about cohabitation that seems sketchy to me (barring regular poor practices that would be problematic for a single housed animal) is at feeding time. My wild speculation says that the activity of one feeding might interfere with the activity of the other feeding. Is there truth to that with the all skittish ball python? The other side of that would be if they're wrapped up together and one part of one snake gets constricted by the other accidentally. Again, is that as silly as it sounds or something you would pay attention to if you kept 2 together?
Additionally:
Two Snakes, one tank... dot com