If you have mounted developer support already, you can set the parameters even through site map (yoursite.com/admin/site-map). There you have "set parameters" link behind your developer support instance.
For some weird reason, DatabaseEnabledP is default to 0. You definitely want to set it to 1, so that the package will show you every db query needed for each page request (and the time they take). I think it's the most useful feature of dev-support, so it should probably be default to 1. Besides, the documentation is lacking behind here, since it still talks about .ini file.
