Personally, I don't see the reason for making one. What area would you improve? Lots of people complain about the data editor but if you're going to remake that you'll either end up with an equally complex system or one with less functionality.
I have a idea that would help. One that makes the data editor easier for beginners, or simplifies it to make it easier. I dont mean combine stuff and make less. But more of rename things and add descriptions to make things lot easier.
Shit at first we had to figure out what did what. So if we had one that renamed them, and such, it would make it a lot easier. Plus make sense
I could think of a dozen things that could be added to the data editor that wouldn't simplify it, but would make life a lot easier.
Several key places (like upgrades) are not copy-pastable, and some things that require multiple objects to be created could be automated.
I find the Data Editor quite puzzling when I first took a look at it. Unit's had behaviors, abilities, movers etc. but half of them were connected to the unit from an other tab (not the unit tab).
Now I understand them better, but at first I had no idea how to add behaviors to units.
I do know this - xenforo dropped the ball by not keeping the vbulletin reputation comments as a feature. The loss of the Reputation comments data when we switched to Xenforo really was the death knell for the site when it came to all the users that left. I know I missed it so much and I got way less interested in the site when that feature was gone and I run the site.
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory