I don't know why you want a tutorial modes. Let's just disable that, and disallow n00bs to join public servers. It is possible. Everyone must walk through a single-player training session, where the most important stuff is explained and tought, especially building and deconning. Once that is done, the client sets something like cg_me_r_pro to 1. And tells you how to set it manually in case you've lost your cfgs, or consider yourself a pro. What about that?