Many thanks to rofafor for the plugin!
I have an OctopusNet with two DVB-S/S2 tuners and two DVB-C/T/T2 tuners. The satellite signals come from twin LNBs and the terrestrial signals from a normal DVB-T antenna. And for added complexity there is a single LNB on a rotor feeding a USB tuner.
I give the OctopusNet high priority, so the rotor is only used when no other sat-tuner is available.
Unfortunately this configuration fails, in particular when programmed timers kick in. Clearly no more than 3 DVB-S and/or 2 DVB-T simultaneous recordings are possible, but I am seeing effects where even the second DVB-S recording get assigned to a DVB-T tuner, apparently.
So I have changed "--plugin=satip -d 4" to -d 2 and set satip.DisabledSources=T, thus disabling DVB-T reception. But it would be great to be able to use all of the tuners. I would be pleased to help with debugging and apologise if there is some configuration option that has escaped me.