This page lets you override the command that runs when a folder in the folder tree is selected using the mouse. You can configure commands for both the left and middle mouse buttons (the right mouse button is always used for the context menu), and you can have separate commands for when the Alt, Ctrl and Shift keys are held down.

The command for each event must be a command that would make sense on a button or hotkey. You can use Opus internal commands or external programs (passing arguments to them using the standard control codes). If you want to run more than a simple single-line command, you can create a more complicated user-defined command and then specify the name of the user command for the event.

The default settings for these events are:

Left mouse button
Middle mouse button