Enable the Time Level functionality of the Timeline Slicer for Locked Worksheets
Whenever you lock the worksheet the Time Level functionality of the Timeline Slicer is no longer an option to use. As a developer this negates the ability of having controls in place so that the end users do not alter the document.
Peter Rogers commented
Add a setting to allow the users to disable the forced Scientific Notation of Security CUSIPs that have an "E" in them. An example would be when importing data from text with a column security CUSIP's. If the user doesn't treat them as TEXT and instead allows for General then Excel converts CUSIPS such as for Target/TGT, CUSIP: 87612E106 into scientific notation thus returning something like 87612000000000000000000000000000000000000000000000000000 as it believes there are 106 decimal places.