If you do not allow your students to submit manual extension requests in WebAssign, they might still request extensions in other ways:
However your student requested the extension, consider the request in the context of your extension policy. If necessary, ask your student how much time is needed or why the assignment was not completed on time. Or, review your student's progress in your class or work on specific assignments (see Review Student's Work). If you choose to deny the request, let your student know why you are not giving them more time to complete the assignment.
For % unearned penalties, you do not need to ask your students to accept the extension ahead of time since points are deducted only when the student answers questions after the original due date.