Looks very useful. I am finding it a pain in the ass to add new racetypes to the game because every faction has 30 different units with 100 bits of data.
For your conundrum of when to unleash the tools, how about for beta 2-B or Beta 3 you simply set mods by default to off, then you don't accept feedback or crash reports or what have you from anyone who has it turned on? And us modders can do our part too, for example you'll find this text or something like it in my modthreads:
Keep in mind if your intent is to provide feedback on the FE beta, you should not be using mods when playing.
Anyway, the modders are already digging in to the xml, so I wish it is sooner rather than later. It does irk me somewhat to not have the workshop available, for example,