I think this feature us pretty unnecessary, since we have plans already for good UI elements that do more-or-less the same thing.
I think its a good thing that the player run the game without sectors. But I think it should be made aplealing to him to use sectors if he so wishes.
Its the role playing bit that attracts me most. All empires on earth where ruled that way. Jurasdictions provinces, the Roman empire is a good example.
A sector management tool, something like the leaders screen in Moo2 but with far more functionality would be an essential ingrediant to me.
Kind of like a heads of state meeting with you the supreme boss.
A place where all sorts of commands could be given, like the ones Sandlapper stated.
Running your empire without it could be likened to using the normal functions of government, whereas the sector screen could be where you wield your emperial privilage and power to get things done, maybe even break the rules a bit.
So maybe there could be a slight $$ cost to using some of its more powerful and useful functions (greasing the wheels so to speak)
This would make it feasible only to an empire thats getting really big.
Access to certian features could be staggered, or limited until your empire improves in some way.
Or as a balancing measure the cost of using your empirial privalges could grow as wealth and corruption increase.
Simply being able to divide Sitrep reports into specific areas of space would be worth its weight in gold to me (bad memory for names)
also impalers words here say it perfect
I recomend that the sectors be specific to the player who creates them. Basicaly each player can divide up the whole map as they wish and the sectors apear only too them. The sector overlay becomes a unique lens that each player sees the game though, players never comunicate their sector maps too each other or have any effect on how the other player percives their own sector map.