Start & End Date Not Working On Recurring Task

I absolutely love the idea of using a start & end date for my tasks. In our firm we tell our employees every week that they need to do a task every Monday-Wednesday with it needing completion by at least Wednesday at 5. I set up practically all of my tasks to have a start & end date showing the Monday-Wednesday feature and set it up to reoccur every Monday. However when I checked off the task the new due date just shows the Monday and not Monday-Wednesday. I would really love to have the start date & end date feature coincide with the recurring feature so every week we don’t have to manually add the new start & end date. Please help!

I’m surprised that no one answers this… it is a very nice feature that we use… well which to use.