Allow users to actually delete custom fields, not just hide them in different views.
I've used Wrike in a lot of different ways and custom fields are by far one of the most useful tools Wrike offers. We really need the ability to delete custom fields because the way our company accomplishes things in Wrike is always evolving. We haven't always gotten it right the first time and have made some fields that we really don't want or need. We've also made some duplicates by mistake.
A big part of wrike is the ability to keep things streamlined and focused on the most important details, and this just adds to the clutter. In our office we use the custom fields a lot when leveraging Wrike's API to integrate Wrike with our CRM software. Having duplicate fields made things especially confusing, we had no idea which instance was which.
I really hope the product team gives this one a bit of consideration.