Follow-up from "Allow disable packages feature per project"

The following discussion from !6977 (merged) should be addressed:

• @rdavila started a discussion: (+1 comment)

  Interesting, I don't see we have this kind of method for other attrs that are used with default_value_for. I recall having found similar issues in the past and it was due I was not using the table helper in the specs. @grzesiek do you think is possible to avoid writing a custom setter method in this case?