I have been customizing and playing around with BricsCAD now for a couple of months. The program is amazingly similar to AutoCAD.
One of the differences has been the display of dialog boxes. I like AutoCAD's dialog box display on the screen better than BricsCAD. I had to rewrite the some of the DCL files to accommodate BricsCAD.
For example:
:arch_program_dimscale {arch_program_dimscale;}
Changed to:
arch_program_dimscale;
Which works for both programs, AutoCAD and BricsCAD.
Another major difference is how the profile manager works...just a little different than AutoCAD's.
Gary