I have started using this app recently and LOVE IT! I have started linking multiple maps together, which is a very nice feature. There are a couple improvements that I think can be done in this area.
1. Allow the user to right click on a node and start a new map with that node as the root. Automatically link the current and new maps together at the node seleceted.
2. Allow the suer to move an entire tree to a new map starting from a selected node and provide the same functionality as in #1.