You might find something useful here. Ok, not really.
Windows users can get a win32 port of the Unix "patch" program here:
http://unxutils.sourceforge.net/
I apply these patches by cd'ing into the "src" dir and doing:
patch -p1 < blahblah.patch
The below listed patches rolled up as one:
Fogcolour, hex cvar entry, read-only cvars, skybox and loadsky, and the "skyfog" cvar.
fogcolour-hex_cvars-skybox-skyfog-cvs-2005-01-15.patch
Fogcolour, hex cvar entry, read-only cvars.
fogcolour_and_hex_backport-cvs-2005-01-08.patch
A patch to restore the skybox and the "loadsky" command to the Jan. 2 2005 cvs version:
skybox-cvs-2005-01-04.patch
Of course you will need skybox textures, like the ones in packages/socksky
from Cube.
The same skybox as above, but with the "skyfog" cvar:
skybox-skyfog-cvs-2005-01-04.patch
Note that Saur uses the "fog" variable to set the far clipping plane, and the
skybox is drawn just inside that plane, so when you increase the "regular"
(non-sky) fog, you also move the skybox farther away, which will make
the sky appear foggier. So set "fog" first, and "skyfog" afterwards to match.