Well, a number of decades ago, Doc wrote
The 55% Solution - a treatise on the Place horse and Exacta/Quinella betting:
http://paceandcap.com/forums/showthread.php?t=6691
In the Library, Manuals section.
No extra charge ...
That said, my plans for RDSS include a dutching and hedging tool enabling easy yet complex wager construction. This should help a lot with Exacta calculations. You still have to find good Contenders though, for Win and for Place.
Ted