The issue is this: building the ACU teleporter basically requires a bunch of extra generators and storage to avoid crashing your economy, but once it's built nothing else needs energy on that scale so it largely goes to waste unless you suddenly decide you need to spam shields or something. Once it's built, using the teleporter is so comparatively cheap it might as well be free. So if someone could make this mod, that would be awesome:

-- Teleporter build cost reduced from 1.5M to 30K (that's right, it's only 2% as expensive as before!)
-- Teleporter energy use increased from 100K to 500K (5x as expensive as before)

So equipping a teleporter still requires that big power station, but you have to keep it around if you want to keep teleporting.

@Sprouto Alright, fair enough.

If I were designing the game from the ground up, this is how I would handle submarines:

-Submarines (when submerged) are only vulnerable to torpedoes and depth charges
-There's no such thing as "underwater vision". You can see your own/allies' subs, but submerged enemies will never be visible. If you have sonar coverage then you'll see a grey "submerged unit" icon. The only exception would be EXP units, they'd have the circle icon. Sonar can see how big it is, but that's it. No indication of which enemy player or its remaining health. No way of telling if it's even a sub or an assault bot walking across the sea floor.
-Subs don't provide vision either, only sonar. So they can only tell the location of surface ships, not whether it's a cruiser or destroyer or which player owns it.
-Make destroyers/torpedo boats and UEF Battlecruiser more anti-sub specialized. How this is done would vary between factions. They could have better torp defense, use depth charges instead of torps (meaning a sub's torp defense does nothing), built-in sonar... I'm sure there are other possibilities.