Hello detimPL,
Centova Cast is only a control panel to manage third-party streaming software such as Shoutcast, Icecast, Ices and Liquidsoap, etc., and is not involved in any way in the processing of audio.
The source programs (ices and liquidsoap) are responsible for audio encoding, an thus it would seem as the logical place to implement or improve this features. Specifically, Liquidsoap has a very active development group, so maybe you should direct your request to them.
They have a mailing list and a twitter account at
http://liquidsoap.fm/HTH