Video tutorial by Ralph Grabowski
BricsCAD allows you to edit the Quad cursor, as well the groups of commands it displays. Add your own commands to the Quad by clicking "custom quad groups". Simply drag and drop the icons in the groups where you want them to be displayed. These settings are accessible by right clicking on the Quad.
This video (5:12) shows you how to customize the Quad cursor:
To learn all of the ways to customize BricsCAD, purchase Ralph Grabowski's Customizing BricsCAD ebook from https://www.upfrontezine.com/cb8 ($40). Available for the current release V15, and all releases going right back to V8.