There are currently no plans to expand Silabs Radio Support, specially when most of the first world countries are already moving away from analog radio, which should only keep working for the next few years.
Whit this plugin the audio pass trough Winamp, so it's possible to use avs, equalizer, dsp, multi channel audio, etc..
But there is a problem. When I set linein the audio is feeded also in the standard manner trough RR, and I have a sort of echo effect. I think that RR must disabled or muted the standard audio when linein is activated. Remember that Silabs sends audio via DirectSound and not a phisical audio input, so is not possible to mute it via mixer.