I presume what you're trying to do is implement a user-friendly interface for implementing M of N transactions (which, I think, is not a trivial task). Are you thinking of going further and investigating an implementation of smart property (http://en.bitcoin.it/wiki/Smart_Property), or at least an interface where smart property contracts can be registered and an API the smart property itself can interact with?

The outcome of some M of N contracts could be actually reduced to algorithms (e.g. betting on the value of MtGox_7day_USD which, I suppose, can be obtained programatically) - would you implement an interface where the writer of the contract can specify the algorithm which decided the outcome? I wonder which type of language that would use. I'd be interested in such a project, but I think it will be quite some time before there would be any real world example of it being necessary. I mean, bitcoin would have to take off before these complex features of bitcoins will be required, I think.