bug#13629: 24.3.50; Reclaim F2 key?

[Jambunathan K]

,---- F2 C-h
| Global Bindings Starting With <f2>:
| key             binding
| ---             -------
| 
| <f2> 2                2C-two-columns
| <f2> b                2C-associate-buffer
| <f2> s                2C-split
| <f2> <f2>     2C-two-columns
`----

According to 
        (info "(emacs) Two-Column")

there is `C-x 6' map for it.

I wonder how common is use of Two-Column mode is.  If it is not so
commonly used, it doesn't deserve dedicated keys.

In GNU Emacs 24.3.50.9 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2013-02-04 on debian-6.05
Bzr revision: 111670 dancol@dancol.org-20130203170256-z4khnm47xc2du0p5
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
System Description:     Debian GNU/Linux 6.0.5 (squeeze)