Currently, the addon only supports saving default brushes in the Brush Group panel. It saves the information about the brush's name and the values of weight and strength. Custom brushes, or those with modified settings beyond weight and strength, cannot be saved in the Brush Group panel at this time.

Yes, the keyboard shortcuts are customizable. You can adjust them to fit your personal workflow.

You can find the installation guide in the product description. The guide provides step-by-step instructions for installing the addon.