Which plugins it loads (either those for gridserver or those for userserver or both) is defined in the opensim.grid.ini file (see opensim.grid.ini.example). Also all config settings are now in that ini file rather than the old xml files. So edit that file with your changes, as the server no longer asks startup questions for those values.
And finally note all this is in a branch so no need for anyone to panic about all these changes.
MW