My projects tend to be organized by sections which contain tasks that require different custom fields. For example, a trip project may have a section on what to pack, expenses, and people to interact with. For the expenses section I might like to show a custom field to indicate the amount. For people I might like to include a URL to their homepage. I only want to see the custom fields that are relevant for each section, and these custom fields may be inherited anyway from different projects.
If this section-level filtering of visible custom fields exists, I would love to know how to use it. If not, I’d like to suggest it as a new option.