Automated Dutch Wagering Available on Any Betting Sites?

[TerraNonFirma]

I'm generally familiar with OddsMonkey, which is mostly tied to Betfair, but I'm looking for a simpler or even an automated way of entering in my dutch wagers before a race, instead manually having to do the dutch calculations as the odds fluctuate.

Any experience or ideas, ladies and gents?

I have been playing the horses for over 20 years, but have very little experience with the US based sites, mostly Bovada and 5Dimes.

Thanks in advance ....

[TerraNonFirma]

It's insane to me that this doesn't exist everywhere, unless of course, this really is a threat to the house?

[Optional]

Sounds like a great feature that should not be too hard to implement.

Not just for horse racing.