Crazy Race House Rules by  Andy Merritt

 * Use 2d4 rather than 2d6 and modify action cards as follows:
   Move 4/10 becomes Move 3/7
   Add/Substract 4 becomes Add/Subtract 3

The effect of this is to increase the effect of card play and track manipulation,
and reduce the effect of rolling high / low.

Note: If you have 2d6 (from the game) and want to use 2d4 then on one dice remark
6 as a 1 and a 5 as a 4.  On the other remark 6 as a 2 and 5 as a 3.  This now has
the same expected value as 2d4 and equal chances of any number (1,2,3,4) coming up.
The distribution does differ slightly from a real 2d4 roll as doubles come up less
often than with a real 2d4.  It works just fine for this game though.

If you feel these modifications are too great, a lesser modification can be made
by using average dice instead of 2d6 (ie. the dice have 2,3,3,4,4,5 rather than
1,2,3,4,5,6).