The problem you're running into is not unexpected: games are written by software developers and software developers don't need front end GUIs for scripting. That said, SC isn't hard to mod. The unapproachable stuff you're battling right now is mostly boilerplate -- learning to distinguish between the boilerplate and the stuff you need to work with is half the battle.
As far as available front ends, the only one I'm aware of is
ZeP's unit blueprint editor. It's an editor and not a full-fledged unit creation wizard so don't expect miracles.
If you're serious about this, you will either need to learn how to mod FA or find someone to implement your ambitions for you. The former is something you can get done in a weekend while the latter will be no small feat unless you can demonstrate your ability to bring something to the table above and beyond the
Nomads project (which you should definitely check out; they've implemented an entirely new faction, balanced it, and integrated it into FAF).
If you want to learn, or see what's involved in learning, this will be an invaluable resource:
http://forums.gaspowered.com/viewtopic.php?f=19&t=2318To get started with a hands-on, by example tutorial:
http://www.hyperimpact.net/downloads/Su ... torial.zip (direct link to download; it contains .doc and .rtf versions of the tutorial text/images as well as source code).
The old GPG forums aren't as active as they used to be, but they are a good archival resource and there are some folks fielding questions in their modding forums that don't post here on the FAF forums.
General mod discussion,
mod development support. SC2 stuff gets posted in the same place so be sure not to get mixed up.