it is possible to create custom "user" fields. When a user is selected, and then deleted later, they still show up in the list. This is nice. However, when I then want to filter on such a deleted user (for example, which tasks had our custom "reviewer" field set to an employee that left the company), I can't select that user. Even when making an export of the list, the custom user field columns are empty, as if nothing is selected, for the deleted users. My request: make it possible to filter on deleted users. Or at least, when exporting a list, retain the names of deleted users in the export, so we can filter in Excel.