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Pretty much any power system could be RFified if someone put some time and effort into doing so. It's all down to whether doing it will actually add anything to using the mod.
Back to the 1.4.7 and before single block farms? You could (since Sengir did publish the code), but it is a real mess as they changed over time, and you'd still need to port it to 1.7.10 once you'd got your head around the code