Hello bucihost,
Unfortunately you are correct, it would appear that autoDJ sources such as sc_trans and liquidsoap, that require the occupancy of additional ports, do so in all available interfaces (i.e 0.0.0.0).
If you would care to post this as a feature request, we'll be happy to link it to our internal tracker, so that -- unless there's a valid technical reason not to do so -- it can be implemented eventually.
In the meantime, you could use the raw configuration option, to bind your AutoDJ source instances to a specific IP address, provided there actually is a configuration option for this available.