Use proxy for source button

If you have a steering wheel control (via Unika for ex.) but you don't have enought buttons.

This allow the button "src" to list source AND other fonctionnalities :

Here is the classic source list:

srclist

Here is the "proxy" one with other functionnalities:

custsourcelist

Each time you push the "src" button you will iterate over functionnalities/sources

The first time you will activate the fonctionnalities and press the button "src", a popup will appear:

srcchoice

Select the Source list entry with tweaker icon and select the "default use" checkbox.