Yes better, but from global point of view group [Internal] can be everything 
Is internal the opposite from external ... ? 
Will it be still internal if you connect a midi clock?  

For me it is a device with 
* Silder  "sync_slider"
* Button "sync_master"
* CO "sync_bpm"
* CO "beat_distance"

What will happen with these controls if we connect to a midi clock? 
Will we have an additional set of controls then? 

I would prefer to have the term "Clock" in the group key, because it is a well known name for this feature: 
http://en.wikipedia.org/wiki/MIDI_clock