Please add the ability to remove the default value of custom fields. On the 'Select list (single)' fields, once a default value is selected, it's not possible to make it blank again.
Our current workaround is to add a value called "Not Specified", but "Not Specified" is still technically a default value. Because a default value exists, this bug occurs: https://qase.canny.io/bugs/p/when-bulk-editing-test-cases-custom-fields-are-automatically-checked-with-defaul
Adding/fixing this feature would probably give us a workaround for the bulk-edit bug.