Better Export/Import (cPanel→BX, Plesk→BX, DirectAdmin→BX, BX→BX)
CMU is good and has lots of it past quirks ironed out. We also have a top-notch documentation on how to use it step by step. Still: Ideally there should be a GUI method for moving Vsites and Users from one BlueOnyx to another (same or different model of BlueOnyx).
Additionally there should be an import option to allow importing Vsites and Users from other platforms such as cPanel, Plesk and DirectAdmin.