Absolute important for publisher...!
Please add group-names. The solution might be the following:
Add 2 text-fields on the instrument-panel labelled "name in group" and "short name in group".
A doubleclick onto a sub-bracket opens a dialogbox where one can enter the full name and a short name of the group, the alignment and whether the inst.name (entered on the instrument-panel) will be left or right of the sub-bracket. Also alignment-settings for the sub-bracket are possible here.
The instrumentnames only appear when the groupname of the bracket is not "empty"
This is a major reason a lot of publishers are using Sibelius only to convert it into Finale.
An absolut must have....