Comment 56 for bug 195483

Upon reflection I think I see where your confusion arises, KennoVO.

Although the GStreamer lamemp3enc is what is invoked by the default and by modified profiles, it still needs instructing using original lame commands, which is why, if you want to try different settings, you need to have the 'gst-inspect lame' listed commands, which is what I reproduced as a PDF file.

'gst-inspect lamemp3enc' merely produces some less helpful information about its status.

I would also add that I am not an obsessed with perfection/detail kind of a guy, having found that in a long career as a professional engineer, documentation, like the software itself is rarely perfect and it's best to just use 'what works', whilst leaving others to eventually come up with a better mousetrap and instruction manual.
(By way of example, in the case of GRUB2 or even PulseAudio it will probably be a long time, if ever, before that occurs.)