Stop the tools panel popping up when selecting a custom brush
The default when you select a custom cutbrush you have created is to pop up the tools palette, presumably so you can adjust parameters of the brush. I allready do all this with keyboard shortcuts so it’s a bit annoying to have it pop up when I don’t need it.
Context click on the button for your brush and add a script action line below everything else.
Select:
Key:Interface: Close tools panel
From the set keystroke menu and that problem is gone.