Ctrl+shift+A is Select Similar on my Civil 3D. Ctrl+A was used to toggle groups in DOS and still works in a macro, but is Windows default Select All everywhere else.
I added a flyout to the "Object Snap Cursor Menu" Shortcut Menu named
The Keyboard Shortcut to "Toggle Pick Style" which toggles Groups on/off is Ctrl+H
If you want it to display and at the command line so you can tell if it's on or off change the macro to ^A