Are you referring to WHMSonic??
As far as I'm aware for Centova, there is no need for seperate DJ port. You use the same port as the stream is on (Just like with Centova 2.2.4)
Centova 3.0 only allows Ices-cc to be used with Shoutcast V1 and Sc_TransV2 to be used with ShoutcastV2
Sadly, only Steve can answer development questions and he is away (Please don't think I work for Centova in any way because I don't! but I have been using the new product for months now in alpha conditions)
I have also setup 2 relays, 1 uses shoutcast V1 and the flash player doesn't work, the other uses shoutcast V2 and the flash player works fine so I am guessing this is a bug...
Mark