In the repair bay window and the warehouse repair window, where there is a list of techs. Can an icon or a letter code be added to the top right of each tech entry that indicates if they are assigned to Maintenance or Refits.
Why?
When a Tech is assigned o refit, they may have to wait X-days for the kit to turn up. It is worth knowing that in the repair bay window so therefore you can decide whether they should be assigned to that multi-engine damage taking x4 the normal period. Or with maintenance, they may not have a full 480 available or assigned, and may be waiting for you to assign them an additional unit for maintenance.
I have considered renaming my Techs to add the "Maint" flag to those assigned to such tasks.
For maintenance just look at the time available. Only techs who do no maintenance will show the full 480 minutes. Use these up first for long repairs. As for techs assigned for refits, that would be a good feature to have, though if they haven't started the refit you will be fine to use them. The refit should start once they are done with repairs.
Also, if they have already started the refit they probably wont show up in the list if they used up all their time (drop zero minute techs).