Copy and then pasting to multiple cells in a table

No, but this might help you do it quickly:

https://pdfautomationstation.substack.com/p/my-keystroke-shortcut-and-copy-and

Not directly, no, but you could add a button next to the first field that will copy its contents to the other fields when clicked. You can also use a script to automatically do it when a new value is entered into the first script, for example when Ctrl is held down, so that it doesn't happen whenever you just enter a new value into it.

No.