It is a little slow pasting something sheet by sheet. Can pasting to all sheets be done?
If a sheet is selected and you Shift+click on the tab of a different sheet, the first one will remain the active sheet, but all the sheets with tabs from the active one to the other one clicked, will be selected in addition. Entereing or pasting into the acrtive sheet will then have the same effect for all the additionally selected sheets.
With Ctrl+click you can add single sheets to the multiselection one by one.