Thanks for the amazing free Software you provide.
I noticed a few things while using it (mainly for UML).
1. I often accidentally place nodes when trying to enter the window, exit from a selection etc. Therefore I would love an option to only place nodes on DOUBLE CLICK.
2. Clicking on the background to get out of a Selection is a fine mechanic, but it would be awesome if pressing ESCAPE would also exit the selection.
3.Pressing Ctrl-Z to undo while editing the name of a node exits the edit textbox without reverting the change, somhow breaking the undo stack, making you unable to return to the old name.
4. I can't see any reason why you would want to highlight something in the palette window but not select it. Therefore it would be nice if a SINGLE CLICK sufficed to change the selected item in this window (maybe as an option).