I would like to see the functionality added so that we can extend existing maintenance windows (unmanaged nodes) using the Web UI. The only workaround we have right now through the Web UI is to remanage the nodes and then unmanage again. This is inconvenient and causes false alarms. The alternative suggestion by Solarwinds is to edit an XML on the SW web server, which is not a practical way.
This would be an excellent and fairly easy feature to implement from what I understand.