My personal dream would be a program that isn't just for Sins, but can be used for many games. It comes with many parts, weapons, etc, that you can mix+match, similar to the ship builder in GalCivII. And you can texture things as you build, or they are pre-textured, so that you don't have to mess around with UV mapping, etc (this would be a great feature). If you want to, you can design your own ships/ship peices, just like a normal 3d modelling program, but again, you have the ability to texture as you go. You can upload your peices/ships to an online database, so that anyone can download and use your custom stuff. Then, when everything is done, you can export it into a ton of different formats, depending on what game you want to use it for.
It will probably never happen (its probably not even a feasable idea), but if I ever start my own software company, this is probably going to be the first thing I make.
The program is already existing... some people call these program "3D software" 
Myself, when i create a new ship, i can reuse old part from a previous ship... mainly guns, rocket launcher, missile, truster, etc...
Online database exist too... on site like renderosity, Daz and several other, you can buy some ship part for build your own one...
By example, you can see below the promo of 2 "nurnies" pack and one "greeble" pack that i use for make my high poly ship... they are not textured but the segmenting/UV is already made... nothing stop the numerous modeler for sins to create some similar pack for low poly model and upload them on a site like filefront... in the same time, a topic can be created here with link to these pack...


