Worksheet protection - UserInterfaceOnly setting should maintain between workbook openings
When developing VBA and/or VSTO solutions for Excel, you might come across the problem that a protected worksheet where the UserInterfaceOnly parameter was set to "True" cannot save its state to the next Excel session. This means that the UserInterfaceOnly setting cannot be maintained between workbook openings. Therefore, to re-establish the setting you have to unprotect and re-protect the specific worksheet (for example during the Workbook_Open event). Unfortunately, since Excel 2013 this might be a performance issue when handling a lot of worksheets (see https://msdn.microsoft.com/en-us/library/office/ff837594.aspx?f=255&MSPPError=-2147217396#xl15WhatsNewProtectingsheets - "Protecting Sheets takes longer"). On a modern desktop computer you would probably not even recognize the performance loss, but you do a lot on a regular Windows tablet. Therefore, I suggest to make it possible to maintain the UserInterfaceOnly setting between workbook openings.
I look forward to receive your votes and perhaps even see this enhancement in the next version of Microsoft Excel.