MediaBay - Sort by multiple columns - ie: by 'Library Manufacturer' A-Z, then by 'Name' A-Z

Maybe this can be done already and I’m not just seeing it?

But certain column sort combos should work mainly:

‘Library Manufacturer’ A-Z
+
‘Name’ A-Z

and

‘Library Manufacturer’ A-Z
+
‘Library Name’ A-Z

and so on

Perhaps just alt+clicking on a column would add a second sort arrow coloured differently?