Perhaps a button ALA C&C Generals that is "Limit Spaceports" could be implemented, and perhaps a unit cap (50 tigers?)
Edit: All optional.
I've seen games where the server can choose the limit of units to have why not have a customisable server system like # of lynx, panther Tigers, spaceports, command centers, etc.
Also the weapons I've advised are somewhat even since Eden has a gun that kills anything in one shot at long range while Plymoth has something that kills virtually anything with less than heavy Renforced armor in one shot but has Ultra Long Range. Say perhaps my artillery proposal could be used to fire light flares instead of weapon rounds.
New Weapons plans: Initiating
Eden:
Rocket launcher 8 rack/ Reload Time slow/ FP Medium/ Range Very Long
8 rockets fire until reload required
Heavy Laser/ ROF Medium/ FP Medium/ Range Medium
Enhanced with certain crystals from rare ore
Plasma Shard/ ROF Slow/ FP Very Heavy/ Range Medium
Fires a shard of plasma that punches through armor and fuses to internal systems
Density particle cannon/ ROF Medium/ FP Light/ Medium / Range Long
Fires particles that fuse to hull and increase mass slowing unit down
Plymoth:
Blast Cannon/ ROF slow/ FP Very High/ Range Very Long
Fires SuperNova explosives encased in armor piercing material
Gatling Laser/ ROF High/ FP Light/ Medium/ Range Short
7 barreled
Particle Disruptor/ ROF Medium/ FP Insane/ Range Very Long
Replaces decapitator beam and is still only mountable on single gun platforms
Doesn't need to be unpacked or packed
Fusion gun/ ROF slow/ FP High/ Range Medium
Fires fusion material that creates weaker material when fused with other things
-5% armor effectivness per hit until repaired on target
Magnetic grenade/ ROF Very slow/ FP Ultra High/ Range Short
Used to cover retreats this grenade causes a + reaction to the vehicle crushing parts of it.