When working in a 2D sketch it would be very helpful if I were able to redefine dimensions. Currently if I have a dimension that was created, then named, checked for export, etc, then want to move what that dimension referenced (either due to a design change, or if I changed my mind about something, or if it was modeled incorrectly the first time, etc.) I have to delete that dimension and recreate it. This can become very tiresome if I have several dimensions that all need to be updated at the same time. It would be nice if I had a option to "Redefine Dimension", similar to redefining a plane, when I right clicked on the dimension so that I would not have to delete it and recreate it.