Ultra is a mod and therefore not under my control. You will have to see what the author plans. I had made a few code adjustments for Ultra in EDEE, so it could be a slow process if it were to happen as EDCE does have a few differences in that regard.
Spirko's "Speed Mod" is currently in the beta - I think he has added a few units. That mod has mostly fit well into the game without radical changes. Had to fix a few things in regards to it.
The philosophy towards mods is essentially everything is exposed, and whether or not it works like you would like is another matter. However, I can be approached with proposed changes and if I deem then not to be too much of a code risk and they do not violate any sacred game rules/mechanics, I can try to get them in. Most mod change requests that come about occur because there is some assumption in the code that needs to be a setting instead...so many changes are possible.