Would be great to be able to set this up - I use the skirt at the start to make sure that ooze is cleared (often it means the first few extrude moves are 'empty') but I can only define the skirt for the primary extruder. If I could do primary at 5mm offset, and the secondary extruder at 8-10mm offset, that would be awesome.
It'd also be useful as a 'wipe' on every layer - skirt and model in one pass, then secondary skirt and supports in the next pass, per layer.