This would be kinda useful for using abilities too, if you had many ships of the same type and you wanted them all to whack one target too... by holding for example shift when you click on the unit to be targeted.
Personally one of my biggest beefs with Sins is the organisation of fleets and issuing commands to individual parts and before you say it, yes, I know, I can just make them into a control group but I feel total war's way of displaying units in battle "might" be a good way to display fleets..
I mean I don't know about you guys, but I have more than enough free screenspace going to waste with the lack of HUD options personally, running the game at 1080p
I'm just a very particular person so... maybe my ramblings are better ignored ^^