[Vortex]

I played about with creating two separate columns, one for the Series name and one for the Series Index. The downside is they aren't "enterable", you cant click on the box and edit the contents, you have to either go and open the Edit Metadata window or go back to the original Series column. If I create enterable columns then they dont automatically display what's in the series / series index columns, so each one has to be updated manually.
It seems odd that there's the option available to have a separate Series Index column but not to turn off the Series Index display in the Series column.

Also If on import there is no series index number in the metadata, Calibre by default guesses that it's number 1. Why not put 0 (zero), at least then we'd know if the number 1 info was from the metadata or not. To rectify this I changed the Auto increment series index tweak to:
series_index_auto_increment = 0
'TRUE'

Which works OK for imports, but there seems to be a bug if you mass copy any series numbers from within the Series column to the Series Index, any line which doesn't have a number in gets changed back to a 1 again...