1. GoldEdit is an abomination. Don't speak of it, ever

I've actually wondered about this question myself. At the moment, some values that are under 128 can't be put to values higher than 128 because they're stored in a single byte. I could fix all of that, but it would make the game completely incompatible with any existing editors. I'd have to write up a new editor for that... the good part would be that the editor would be rather easy to make, since every unit/structure/infantry item in the section would have exactly the same size.
Still, I'm too busy with school work to invest time into this right now, so I'll just leave it.
2. Nope, sorry. That's changing game mechanics in a way that affects single play. Won't do it. I don't even have a clue how I'd do that. Not to mention, it means that moving a squad of infantry to death on a tib field would spawn 5 visceroids on the same cell. Visceroids are vehicles, not infantry.
3. That would be rather useless. The 4 entirely new units I'm adding to the game have the annoying side effect that the dinos can't be made buildable.
4. Hyper might look into that. Not high on my priority list though. We are looking into a quick build key though. "P" would repeat the last production, and if you press "P" again when it's ready, it'll trigger the Placement. This would help to speed up building walls, since you won't have to move your mouse much at all.