We love the LTI integration with Softchalk.  However, we would like the ability to have a due date and time that makes the LTI not accessible.  As it is now setup, once an assignment reaches its due date, the LTI link is still active.  A student would be able to complete an assignment after the due date.  Please add the ability to have an LTI link expire for students at the deadline and at a specific time.