Tools such as The Enhanced Editor are very useful, but in my experience they tend to leave you with an editor jam-packed with useless rubbish like millions of different projectiles and a confusing number of gate objects. Also, a useful function of data editing is to make objects easier to place, but to my knowledge there is no data file available that does this.
This is a cleaned up version of the data file I've been using for a few years, which deals with both of these problems. It doesn't do anything revolutionary but I still think it can be useful.
1. Unhides some useful beta units (Infiltrator, Junk, BDGAL, relic carts, etc)
2. Makes common eye candy much easier to place, allowing stacking, overlap and placement on any terrain.
3. Unhides all of the different villager types, except for the duplicates (eg builder and repairer are the same thing).
4. Does not affect gameplay, only the editor.
5. Explanation of a few lesser known but useful objects which have been included.
6. No one who has tried it in multiplayer has experienced sync errors.
The Designer's Editor is a utility that allows you to overlap certain Gaia objects over each other, like mountains. That's very useful, cause you won't need to do this with map copy anymore, which can be very time consuming to get it work out very well.
It also unlocks certain units which are very functional. But not all of them seemed for me of a good use.