Doubtful requirement on radio input field [5.3.0-B1]

In the "Ban Rules" section we have "Rule Type" required field, that is shown as radio input field. It can't be empty:

1. "Deny" value is selected by default, and it is impossible to make all radio buttons unchecked through standard web interface.
2. Also, if all radio buttons are unchecked (using firebug or other page manipulation tool), after form submit there are no error on "Rule Type" field, and "Deny" value becomes selected.

Maybe we must choose one of 2 solutions.

1. remove requirement from this field.
2. made default value beyound selectable values, and proper validation, so initially all checkboxes are unchecked and user is really pushed to make choice and enter some value in this field