In the secure and session based environment, it may take a while to design a report. Meanwhile, the session may expire. Or even anything could happen e.g. internet loss, power loss. In that case, all of the designs that the user has made after spending a lot of hard work and time; are lost.

There should be an auto-save feature in Report Web Designer. It would be great if this is API based. e.g. AutoSave(true/false), AutoSaveInterval(seconds), etc.