I have always found it inconvenient that your shop closes every time you switch channel/account or crash, sometimes you forget to open it and get that tragic feeling of "I could have sold something during that time, now I have to offer this item for another 40 hours before it gets sold..."
Could it be made so that even when you go offline, the shop stays open for ~5 minutes before going down too? This effect could also be added to specialty shops and premium shops that have no offline time left.