One of the biggest thing I've wanted for years is an expansion of the old Lunar Wars unit upgrade system.
In Lunar Wars, upon hitting certain thresholds of *AI* (I believe, its been a long fricking time), new upgrades for your units were unlocked. For example, you could buy AIM-99 missiles for your Orbital fighters, which was a significant boost to damage done. However, the issue is that the admin sandrob lost interest and never added much more, so that over time the upgrades just became standard. There was also no choice to be had, just a simple upgrade.
What I'd like to see is a set of 3? upgrade for every unit type to buff defensive power, offensive power, or cost/effectiveness.
For example - tanks could do 10% more offensive damage, OR be equipped with some sort of AA gun (this would have to be tuned very, very carefully), OR cost .5 less per tank.
Planes you could do the same thing - 10% offense, OR defense, OR cost 2.5 alum vs the present 5.
This would require choices to be made by individual players and provide a bit more strategery - I'm attacking Prefontaine - hmm, he has the defensive boost. I should bring along 2 other guys that have the offensive boost to counter that. Oh, now Prefontaine's alliance has attacked us with 3 guys with the offensive boost, and killed our planes, while Prefontaine was able to hold on. ect ect.