I don't think it would work directly through scp. From what I can tell from skimming the source, it is really just a wrapper over ssh. Meaning: it forks an ssh, with the commands 'scp -t/-f' on the distant side, and does its magic to connect the pipes where they should go. 'scp -v' gives the exact command, but I don't think it works without previously having a shell.
But, if you have access to the filesystem through other means, you could use the .ssh/rc trick to bypass /bin/false, and get ssh access.
I don't think it would work directly through scp. From what I can tell from skimming the source, it is really just a wrapper over ssh. Meaning: it forks an ssh, with the commands 'scp -t/-f' on the distant side, and does its magic to connect the pipes where they should go. 'scp -v' gives the exact command, but I don't think it works without previously having a shell.
But, if you have access to the filesystem through other means, you could use the .ssh/rc trick to bypass /bin/false, and get ssh access.