I won't be at all upset if this patch doesn't make it in.  I haven't yet
thought of a really good use for it.  Whilst reading the manpage for the
Plan9 shell rc(1), I saw:

----------------------------8< cut here >8------------------------------
      . [-i] file [arg ...]
              Reads  file as input to rc and executes its contents.  With a -i
              flag, input is interactive.  Thus from within a shell script,

                   . -i /dev/tty

              does the ``right thing''.
----------------------------8< cut here >8------------------------------

I couldn't resist.  :^)

-Phil