I'm very familiar with these modules, having used them in several frequencies. I imported them directly from Wen Shing (after first suggesting to Bruce that he stock other frequencies) although there are now several manufacturers who supply the same design.
To answer your questions - yes, you can eliminate the encoder/decoder - I've posted example code using them to send/receive NEC protocol which I prefer to SerIn/SerOut. And, the only functional difference between the 433.92MHz and 315MHz models is the frequency.If you search, you'll also find many, many threads from people using them with SerIn/SerOut which might say something for my preferred method.
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