Comment 1 for bug 1898132

We already have [group],stars_up / stars_down, check https://github.com/mixxxdj/mixxx/wiki/mixxxcontrols. They are also available in the User Interface menu in the mapping wizard.

Having a mixxx control to pick the 'active' deck is unnecessary: with a script function you can easily read the crossfader and/or Vol faders and decide which deck the controls should affect.