Thanks, guys! I appreciate the detailed bug reports! Working through them as fast as I can.
Another strange thing I've noticed is that the categories within a tab have been flipped in order.
Just pushed out a quick fix for field ordering that ensures that name fields and universe fields always come first; the other fields are still somewhat out of order, but I plan on adding the ability for anyone to reorder fields (as well as categories) pretty quickly. Ensuring name and universe come first (as they're pretty important and don't really make sense at the end of the form) should be a nice stepping stone toward that.
I'm wondering if it might be better to have the default categories able to be hidden but not deleted (or possibly a 'reset to default' button)?
A "reset to default" button is exactly what I have planned! The code to do so already exists in the back-end, but I need to hook it up to that page so people can do it at will (and figure out some weird edge-cases with it around how to handle custom fields, what to do with answers on existing fields, etc). Soon. :)
Being able to customize the fields/tabs/categories for each individual page as opposed to all pages of that type.
This is something that's been requested a few times that I need to think through more of how to actually implement it, but I'm definitely for this idea as long as I can make it clear what's happening in the UI (so people aren't confused some fields are on some pages and not on others). Definitely on me though, so I'll see what I can do.
In further updates (whenever you get the essential stuff done, of course!) will renaming one's custom categories/fields be an option?
Yep! Reordering and editing are next on the list – not just for your custom fields, but for all the default fields as well. The new system effectively treats default and custom fields the same (with the exception of name, universe, and linking fields), which makes adding this kind of functionality a lot easier without having to add a bunch of logic saying "if this was a default, do this, otherwise do that". More customization is always better in my book, as long as there are some safeguards in place (like a "reset to defaults" button). I want to make sure everyone can customize their pages exactly to their wants and specifications – even the default fields (which, I guess, can be viewed more like "suggested" fields now). :)