This is perhaps an unsolvable problem, but when adding a custom field, the end result text shows up in the enormous size by default, instead of the much more friendly standard block test size. I added custom fields hoping to input large amounts of information there (since I've been using the site to coördinate word documents for my D&D players) but the result once saved was illegible due to being basically the equivalent of ALLCAPS due to the text size. It would be useful to be able to select what text field type shows up in a custom (or extant) field.
As well, I second those who call for adding fields to extant subcategories, the need for minor character status, and the need for nesting in locations. Nesting everywhere, really. The "Groups" tag is not as useful as simply having the option for organising characters at the character level, as would be useful for organising locations. I'd suggest
Locations» Planet (Earth/Middle Earth)> Country (France/Rhovanion)> Province or area (Normandy/Mirkwood)> City (Rouen/Elven-king's Halls)> Locale (Church of Saint-Maclou/Thranduil's Throneroom)
But really, having user-defineable nesting would be best, especially for people who want to get in very deep for, persay, Creatures differentiated by taxonomy. Some people would just like to sort locations by country and city, others by borough and block. Some people would like to sort by protagonist and antagonist, others by specific clans or holdings, all within the character tag. Some people might have large lists of items or spells they'd like to nest by type. In fact, this would be a great incentive to add to premium membership! Premium: access to all categories and custom nesting and organisational options! However, I fully understand that adding these organisational options would require quite a bit of extra code.
Dungeon Master insight: I've been listing custom classes as separate races and frankly that works for now, since on character sheets I can select more than one "race." I don't think there's utility to adding a "jobs" category, but I figured I should make my workaround public for other DMs who might read this board. Also, tables in text fields?
Master in Linguistics insight: The languages tab is… very bare and uninviting. As a dream, I'd love for Phonology to bring up an interactive IPA chart (click on a phoneme and it gets highlighted and used in the final phonology) plus a notes field for phonotactics etc. But that is just… asking too much, I'm entirely aware. However, it remains really rather hard to get a table of any sort into the text field, and tables are essential to grammars relying on conjugation or multiple registers. Entities has just numbers and qualifiers? Like, there's nothing here other than a text box for dumping a complete grammar, because the other sub sections are less than helpful. Not all languages have conjugations, but a few subheadings under Grammar for things such as Sentence Order, Register (move it here), Verbs» Tense Aspect Mood Negative Questions Agreement, Nouns» Case Number Person Pronouns Noun-Clauses, Adjectives/Adverbs» Placement Agreement Conjugation… would be nice and probably helpful. Typology separate from phonology is super unhelpful because it's unwieldy to have to go to a separate section to learn the orthography of the sound system you've just read.
I once did not have a master in linguistics insight: For people who are real newbies at language, I think it would be really super helpful to expand the "Entities" tag to include just some basic vocabulary groups. Most people making languages just need to know the phonology and a basic themed lexicon for character and map naming! So it's helpful to have some basic lexical entry groups such as: Numbers (already here), Colours, Community Members, Common Plants, Common Animals, Landscape Features (river, mountain, field, town, road), Heroic Attributes (big, little, brave, shining, beautiful), Tools & Occupations (hunter, smith, singer, sword, hammer, lyre), and Traditional Names (Moses, Brittany, Megatron, Apollo). This well covers naming places and even people as long as the beginner is reminded to have rules about adjective order in their language: a language could put adjectives after nouns as in "forest-green" but not "green-forest" or "for-green-est."