If you're looking for an AutoHotkey script, this one should probably do!
Here's an implementation for copy on
select. You can simply select some
text and it is copied immediately
without having to press ctrl+c.
Conveinent middle button paste is also
provided, but with a twist.
Middlebutton is useful in browsers, so
there is a short time (configurable)
while you can paste with the middle
button after copy, before original
middleclick functionality is restored.
Also, if you click with the right
button it cancels middlebutton paste.
Since after selection you usually
click with the left button to the
place where you want to paste, so that
you put the focus there, it is done
automatically when using middlebutton
pasting.
clipx integration is also added to
Ctrl+middlebutton.
I've been using the script for a few
days and it's quite convenient.
Sometimes the copy tooltip appears
unwantedly when something is dragged,
but it doesn't cause any problems.