auto-paste from clipboard

in "Paste from Clipboard", users currently have to find the keyboard shortcut or open a context menu (right-click) to paste clipboard contents.

It would be easier if the contents were automatically entered by a JavaScriptlet similar to this:
{
document.Form1.txtArea.focus();
PastedText = document.Form1.txtArea.createTextRange();
PastedText.execCommand("Paste");
}