This plugin turns the dvbdevices into hotpluggable devices. They can be dynamically attached and detached while vdr is running.
Don't forget to patch the vdr-source, you find the necessary one in the "patches" directory of the plugin sources.
A vdr repository with this patch in an additional branch can be found here:
Other plugins can hook up into this mechanism with the new cDynamicDeviceProbe which is added by the patch. Look into the pvrinput-source for an example.