I guess they are there not just for fun...
Noise shaping & psycho acoustic algorithms: -q <arg> <arg> = 0...9. Default -q 5 -q 0: Highest quality, very slow
If you are being tod -b 320 is the best quality possible why are you disagreeing. If there was a superior setting we would tell you.
You may also want to ask yourself the question, "Do I need the best possible quality?", as it's extremely likely that you could create files averaging less than two-thirds the size in VBR at -V2 and hear no difference whatsoever.
what about changing the cutoff frequency range for example?
I would also use higher bitrates for this purpose if they would be available. Of coz I could use WAV too but I prefer to have all the metadata in the ID3 tags which WAV doesn't support at all (at least not that I know)
I don't know your systems, but there are lossless encoders that do support tags, and which are guaranteed to be of identical quality to the CD. FLAC is widely supported (though not, alas, universally); the other relatively widely used one is ALAC, the Apple proprietary format, which is unlikely to be supported on third-party systems, and which ought to go away.There seem to be a few instances where any lossy encoder can lose transparency. Whether or not your patrons would actually register these moments in the heat of dancing isn't clear, but if FLAC works for you, it would give you peace of mind.
So I'd like to know if can use some other switches too to pimp the quality A LITTLE BIT!