Suggestion for Endor:
Endor is basically just an inferior infantry map. It lacks the intensity of the urban setting, which is best for Infantry combat, the trees are a poor substitute but doesn't have the thrills of a good combined arms map, so its very lacklustre IMO.
I think it could be improved by turning it into a sort of a compound assault map.
Eliminate the tedious part where the rebels have to advance through the forest on foot, capturing a line of pointless and uninspiring flag bases, and just skip to the part where the rebels assault the large compound instead. Make it bigger, add various objectives to blow up inside it, lots of nice fortified positions outside, AT-STs roaming around, and maybe some portable artillery so we could get a nice siege battle with lots of blaster fire and explosions.
You could still have the famous Endor scene recreation by having the rebels' initial spawn a ways down a forest path, and with a ton of speeder bikes. This speeder wave could then capture a relatively easy permanent spawn or two near the compound (like Iwo Jima and Omaha beach flags in BF1942) so the compound assault could properly begin (make sure its very easy to get for the rebels cuz if the imperials can grab it first, the game would be a rape). This would make Endor both a lot cooler atmospherically, and a more unique concept.
Other suggestions:
-Add a fleet battle where a swarm of rebel starfighters are attacking an imperial ship squadron so it's kind of a fighter versus fleet assault. The Imperial fleet could be static, add a lot of anti-fighter lasers to ship (and remove the big anti ship ones since theyre pointless), but dont give them as many fighters as the rebels.
-A combined arms map, my suggestion is cloud city. I found that to be my favourite GC map, was a cool setting. My suggestion would be to have it as kind of an objective assault based map, Give the defenders 4 hard points to defend, 3 of them shield generator protecting the final main command centre. The attackers have to blow the first 3 before they can hit the the HQ. Each hardpoint should have a lot of fixed laser turrets and stuff (and make them in a triangle and not extreme distance so neighbouring ones can help cover each other decently). The attackers would have a lot of fighters and bombers to fight the turrets with, and also some heavy lander ships that could take a few hits to shuttle troops around in. Also give them a corvette/frigate hovering a distance away that officer classes could call in a heavy laser barrage with (but make it so they need to be accurate, to take out fixed emplacements, not something jackasses can use to just lay down mass spam on spawn points with, they would be more for atmosphere, like the Ion Cannons hitting the destroyer on Hoth, than for owning up the enemy with).