Hi, no there is no need to set the JthinkMusicServer address (which serves both MusicBrainz and Discogs pages). The Preferences:MusicBrainz:MusicBrainz server address is just used for submitting data and for the Match to Album:Match to Specified Musicbrainz Album, this lookups the MusicBrainz release if not find on JThinkMusicServer and provides a way to tag songs that you have just submitted to MusicBrainz as a new release.
Because the JThinkMusicServer is very different to a MusicBrainz server Jaikoz can no longer use a local MusicBrainz server. But using a local server was never very easy and was used by only a handful of customers, and now that Jaikoz 8 with the JthinkMusicServer is considerably faster it is not really neccessary.
The differences between Jaikoz Pro and Jaikoz have now been overhauled so that the lookups from Jaikoz Pro are twice as fast as from Jaikoz (Previously there was no difference between the two unless you were using a local server). But Jaikoz standard customers don't lose out as even Jaikoz standard is much faster than Jaikoz 7, with an average increase in speed of 400%