This isn't a bug per se as I don't think there's any other way of checking if a user is pasting something;
1. Put the following in remote:
on *:input:#: echo -a $inpaste
2. Activate a channel window.
3. Type $crlf and then hit the tab key.
4. Press any key.
You should see "$true" in the window, I don't think there's any other way of checking if a user is pasting something other than seeing if there's a crlf at the end of the line, so I suggest not being able to use the tab evaluation feature with $crlf.