Looking at the LTC 1799 design notes it appears that one could make a double speed and halfspeed switch for DMG by setting the 4th pin (DIV that is) to 1 and Rset to 12k (for x2) and 47k (for x.5).
Except these values are a bit rounded to the closest resistor value available. It's really 47.6xxxx and 11.9xxxxx.
My question is has anybody done that and is it the .04k and 0.01k difference crucial for LSDJ to be in tune?