One I worked out that's had some good results. The rules might be able to be tweaked a bit to suit. As is it has good form logic.

1/-1100m-2200m
2/-57kg or less [include claims]
3/-g or d tracks only or won in conditions.
4/8-14 runners only
5/-3rd, 4th or 5th up only
6/-4-5 yr.olds
7/c, d or t in formline
8/-10 to 18 days since last start
9/-up or down in distance 200m only
10/-If more than 2 qualifiers, ignore the race

How I bet them: $8 or less sp back for W only and above up to $20, back for P only.