We have solved our local problem (as far as I understand, it is not a general solution) by adding into source code overloaded version of RunCommand(, Action<> InteractiveResponse). We have found that, when an interactive program asks for input (even if the prompt is empty) SshCommand's method Channel_DataReceived() gets fired. When this happens, we immediately ::SendData(...). These data are then pushed by sshd into remote program's stdin. It seems that these follow up messages do not violate any RFC.
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