You could make custom controls...
1. Take Input 6 and turn key 1 OFF
2. Take Inputs other than 6 and turn key 1 ON
I would build each custom control above the input it is controlling
---- another way would be;
Make a custom to take input 6 and turn key 1 off, then add the dialogue to select key 1 and background... you then have to preset the next source to take on preset and press cut manually.
#Carbonite