Empire at War style cinematic camera.

Turn off AI surrender, or at least make an option to disable it.

Planetside (surface-to-space) weapons capable of firing into orbit. Will make now underused siege frigates more useful, since destroying all orbital defenses would not be enough to secure the gravity well.

Colonizable asteroids and moons could really use some sort of indicator that they are inhabited. Its fantastic that the planets have city lights, etc on the dark side and the elevators. Moons and asteroids really need something similar.

I would request making the ship/station/planet name character limit longer. I cant even name my ship TDN Enterprise without it being cut off. The text could get progressively smaller as the name gets longer, to avoid it going off the infocard.
A way to also name fleets would be uber cool.

I would really like the possibility of being able to fleet down, if I lose many planets. Now fleeting up is a definitive decision.

Automatic fleet splitting. I propose an automatic fleet split button, which would split all corvettes, frigates and cruisers in a large fleet equally into smaller fleets, because manually splitting large fleets is a pain in the ass. Or GalCiv 2 style fleet manager window.

More celestial object types (planets, nebulas..).

More technologies. 

Cloaking technology.

Option to rejoin a multiplayer game (or join after its running).

Include Bailknights graphics mod in vanilla Sins.

Trading ships, planets and technologies with other players.

Fix the "arcing turns" issue. 

If you destroy them, the player they belong to loses trade income. 

Seeing as how none of this is happening within three days, in a wonderful world where space ponies could roam free and the devs have a magic programming toaster I would like to see the following:

1. Perfect balance
2. Multithreading
3. 64 bit

Does the grass mow itself?

You can 64bit patch the exe, to allow it to use more than the allotted 2gb of ram. (www.ntcore.com)

Although I have yet to see the game acquire memory usage numbers it did in older days. I generally see 800-1gb used now.

Well I don't think we need to go into why, but this is the same list I'd submit.

For the auto ship replace, I think it should work like this:

-Player designates a fleet number
-Once ships die in fleet, their costs are deducted from the player's reserves (if possible) and the replacement ship gets built in the nearest port.
-Fleet rosters are only kept from the last time a player designated for the fleet.  If one fleet gets merged into another, they are still regarded separately.  This way it won't become an enormous CPU crunch; you could only have so many variables per game, not the entire history of fleets. 

Alternatively, fleet ships in the sidebar could show a red silhouette of what's been destroyed.  It would really help.

- Vorastra Titan to eat planets instead of Desperation (and Stripped to the Core)

- possibility to turn off Empire Tree completely

- ships to keep reasonable distances between themselves to prevent starcraftesque clusterfucks

- better performance, so i dont have to decrease visual candy on my GTX590!!! to prevent unbearable stuttering and crashes

Is it something wrong that I don't want nor care for any of the things listed in the opening?

Maybe it's just my annoyance will people whining over something like mines. Seriously just use scouts with flak to clear a path and if you leave the system just use a scout with auto attack to clean up the rest behind.

Superweapons can be countered.

Unless, of course, you're dealing with Advent mines in which case, your scout will run headlong into the acquire range of the nearest homing mine and get blown to pieces. 

I'm sure they're no trouble at all in multiplayer (do people even use them in that setting?) and they aren't 'difficult' to get around.  The trouble is that they tend to make an already tedious endgame in SP signficantly more so without really adding anything of value to the experience. 

edit:  And yes, performance is a consideration too.

About the only mines you see in MP are Vasari mines, because you can deploy them in the middle of a fleet and wreck havoc....

Requested for a friend:

Another Missile for the TEC. A shorter range, Titan-Buster nuke. Instead of just the long range Planet Nuke.

(Think Heat Seeking, but the cost is it can't travel as far.)