+ "Hero" units with different stats, ability, bonus, gift.
+ Comets, asteroids, and anomalies that require higher-level sensors to find them/anomalies that regenerate
+ espoinage mission
+ More silly stuff that happens
+ More moral decisions and maybe some could have important impact on the univers. (i don't like the +4 to your soldier skill)
+ Ability to colonize lowest-level planets, or at least to put outposts on them
+ Pirate planets/bases
+ ability to blockade a planet
+ asteroid field. you could hide or build base for mining, research or for building starship
+ survey planet before knowing with it is(could have anomalie, event, monster, pirat/smuggler base)
+ more use of influence
+ put more thing in space. nebulas, neutron star, supernova, black hole, monster, asteroid field...
+ different tech tree for each race or tech tree like moo2 in wich you have to chose.
+ terraformation of class 0 planet
+ tech to colonize uninhabitable world, water world, volcanic world....
+ indigenous life on some uncolonize world. you would need to fight. like a planet investe by dangerous creature.
+ more event/moral decision when colonizing a world (or invading it)
for ground combat.
1: you would have to train soldier, not use the population
2: for specefic world(ice, volcanic, water, dune like)
option a: you need to research the underwater/overwater invasion(not colonize) training to invade a water world. this would anable your soldier to invade.
option b: you need to research the spec type of world then train the specefic type of soldier to invade
ex: research water world. so you can colonize water world and train water millitary regiment.(compose of ship, submarine, aqua soldier...)
option c: you need to research the water spec type so you could colonize and invade water world
3:have some heroes that are really usefull for invasion (general, sergent, veteran..)
4:you could chose where you invade on the planet. like a mini boardgame.
5:environement should play a large part of the invasion. (meteo, ashe strom, volcanic eruption, strom, snow strom)
they would have different impact. like, snow will slow your progress and reduce dammage(low visibility)
6:use your soldier for mission like hijacking space ship. infiltrate pirate space base. to raid a planete before the full army come in...
7:put more invasion option.(maybe the most realistic wish)
that is what i wish, mostly i'm dreaming but......