Another user suggested alternative layouts like hierarchical views, but another layout that would be useful for me is a linear sort to be able to see nodes in order of when they were created/edited. This would require associating timestamp metadata with each node. I'm not sure if this is already done, but even if it is, being able to sort over this metadata would be awesome.

The suggestion for alternative layouts is here: http://mindmup.uservoice.com/forums/200447-what-should-we-focus-on-next-/suggestions/4126728-provide-alternative-outline-view