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No, implementing it would be easy. Implement it (don't forget the UI), test it on the test network (where it is pretty trivial to get non-IsStandard stuff into blocks), and then lobby for a new 'standard' transaction type.
theymos, please stop acting like the current IsStandard test is set in stone. It is not, and, as Satoshi said, new versions of the client are rapidly adopted by a majority of the network, so introducing a new transaction type will not be a big deal.