I just ordered the Mighty Mouse kit from BYOC, a Rat clone with 3 settings:
"Throughout the entire history of vintage
guitar FX pedals and their reissues, the
Rat reissue is probably the only one to do
the original justice. So why would you
want to build a clone if the reissue sounds
good? Well....aside from the fact that the
reissue is relatively expensive for a mass
produced pedal, it comes in a big funky
enclosure, and the obvious joy and
bragging rights you get from building your
own pedal, the Rat is the most amazing
circuit to modify. And the BYOC Mighty
Mouse Kit just happens to come with a few
of the coolest mods for the Rat circuit.
The 3-way toggle switch gives you
"vintage", "big boost", and "overdrive"
modes. "Vintage" of course gives you
original specs. "Big boost" lifts the clipping
diodes for a boost with an insane about of
volume. The "overdrive" mode isn't part of
the typical 3-way switch mod that some
pedal modifying companies will do to the
Rat. The "overdrive" mode involves a little
more circuit bending than just changing
the clipping diodes from 1N914's to LED's.
The "overdrive" mode gives the circuit a
completely different flavor from the regular
Rat with LEDs in the clipping section. The
kit also comes with the parts to build to
"turbo" specs instead of "vintage" and a
few other parts to tweak to taste."
http://www.buildyourownclone.com/rat.html