Well there is an option for that in the permissions section but it's limited to experts, editors, moderators and admins only and in my case there's just no need for it.
Locate this line: https://github.com/q2a/question2answer/blob/4fce0eb2390f56b645dad375d1d81e9f91a97e69/qa-include/pages/admin/admin-default.php#L1349
Turn it into:
elseif ($optionname == 'permit_edit_silent')
Now you should be able to set the value up to registered users.
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