--- The ability to group STOs and ship bourne Fire Controls alike into "Fire Groups". You can currently already copy and paste FCS settings for from Fleet to Fleet and from a ship class to other classes in same Fleet, but this would allow a group of FCS systems to be assigned target priorities, firing conditions (like "Fire when shields are at X%", "Hold fire if target shields are down.", "Prioritize Ships with Beam Weaponry.", "Target FACs only.") & even set preferred engagement ranges... or a combination of three and/or more!
--- A simple numerical priority for Ship weapons with regards to power as well as an ability to just... turn off weapons to save power.
--- Armored Reactors, and hell... just the ability to Armor modules more in general. The Armoured Reactors would make the above suggestion more useful since you could divide up reactors a bit more and worry a little less about them exploding.
--- Remove the restriction on Direct Support for Ground Formations. I'd like my big ass frakk you Artillery Divisions to attack the enemy when my big ass frakk you Armored Divisions attack, and I'd also like to not need to worry about the size of them in general. IRL, if someone of sufficient authority goes, "Hey, have that unit support that unit." they're not gonna say "No, sorry my unit is too big, and thusly the request is impossible to comply with." (Mostly I just find it annoying without really adding anything. YMMV
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--- The ability to assign Ground Formations to Directly Support other Formations as Attack or Defense elements: Setting one to Direct Support (Attack) means it attacks when the formation it is assigned to does, and targets only the formation that was targeted by the formation it is supporting. Setting one to Direct Support (Defense) just means when said supported formation is attacked, this unit is also attacked and contributes to the defense.
--- In that vein a Breakthrough Support stance would allow us to make formations that only came into play when an enemy achieves a breakthrough, but would otherwise be counted as Support Line for any other purpose.
--- Likewise, allow Support and Rear units to actually attack back if a breakthrough occurs. It'd add some usefulness to "guard" units.
--- Perhaps have "Avoid Combat" not affect Bombardment units in the Bombardment Phase if they are set to Support or Rear? Would make the above more useful since "Guard" units could be set w/o "Avoid Combat" and would count more. AA units in the AA Phase when in the Support or Rear stance should be included in that as well.
That's my 2 cents. Well done on 2.0 Steve! It's fuggin' awesome!