Some might not call my problem a bug, but a known way of working with the UI. However I consider it a dangerous side-effect of a provided feature. The first time I encountered the utility of selecting multiple sheets, it was in connection with exporting a document as PDF, and is very useful for getting defined print ranges from several sheets into the same PDF document. After doing this I then continued editing one of the sheets, and later discovered, to my horror, that I had been modifying multiple sheets. Now, even though I am aware of this behavior, I still find myself forgetting to deselect all but one sheet after exporting. I can think of several possible ways to reduce this risk: 1) warn that multiple sheets are selected by changing the little gray bar underlining selected sheets to bright red (maybe even flashing) when multiple sheets are selected. 2) provide a global preference to prevent modifications in multiply selected sheets. 3) augment the menu for export as PDF by providing a sheet list where the user can select which sheets to export (perhaps even in which order).
1 for 1)