Can anyone reproduce and confirm if this is a bug in X2A?
 
In regular tracks, if you use the Select tool (F6) you can grab hold between two automation nodes and drag the section up/down. But I can't get it to work on buses! :P
 
Edit: The Select tool does not seem to be able grab nodes or anything at all in buses...

Can anyone reproduce the Select tool weirdness above?
 
But the Move tool seems to work consistently with tracks and buses - you can grab hold between to automation nodes and drag that segment up and down.