Could do indeed. Although I was planning to leave it until a few weeks after it came out, so I could get input on what people may like to have userboxes for.
If I remember rightly, we only have Progress and Favourites boxes for Fable/TLC, so I'll be expanding that anyway to include silver keys and demon doors. I was also thinking of having a box for each of those consequence achievements so that you can add which objective you got "first", and edit it if/when you get the second one (which wouldn't be documented any other way).
For now, we could have ones like "Pre-ordered from ..." so when info is released we can know whom will get which DLC content from day one. Like how we did for Fable: The Journey with the preorder userbox, then work on them more when its released?