Highlight attribute in channel box (for MMB dragging)

Hello,

is there a way to highlight a specific channel in the channel box every time an object is selected? I’m thinking of custom attributes like ‘Heel Raise’ on a foot control. If I can highlight a specific custom attribute to make use of MMB dragging in the viewport I think that might really speed up the animation workfliow (as opposed to going back and forth to the channel box).

Alternatively, is there a way to control what MMB dragging affects?

Many thanks!