They are all useful, except for maybe Pause. Ctrl+Insert and Shift+Insert ist like Ctrl-C Ctrl-V, but it works in terminals too. Home goes to the beginning of the line. Shift+Home marks the line from current position until the beginning.
Scroll lock is useful for Excel. It makes the arrow keys scroll the spreadsheet without changing the currently selected cell. This was actually the original use case for the scroll lock key.