The feature I would love to see added to the game is the ability to produce ORBITAL research facilities. The way I invision this would be to have a research comonent that could be placed onto a starbase or battlestation. (the cost of the comonent would be 2000kt) It would add 10% to the systems research efforts.
Additionally, I would love a feature that showed a player what enemy ships are in the area of space they are about to enter. (Kinda like the one used in Rebellion) This would be very helpful in evaluating wheather or not you wanted to engage the enemy, and vis versa.
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"We've made too many compromises already, too many retreats! They invade our space and we fall back -- they assimilate entire worlds and we fall back! Not again! The line must be drawn here -- this far, no further! And I will make them pay for what they've done!" -- Patric Stewart as Captain Picard
UCP/TCO Ship Yards