Yes, GStreamer is a complete (...), or send commands to change its behavior. I have access to all the same parameters, I just need to make those parameters available to you (in some form).
I'll see about adding controls as I go. I could probably re-use Pierogi's "endless panel" mechanism here to provide every last detail of every last element, if you'd like...
along with an "Auto" mode, which apparently chooses the mode that most closely matches the audio source). And, they've also got a separate "Quality" parameter, with an integer value ranging from 0 to 10. Anyway, I'll see if I can make these parameters available...