As Stephen says, it is unusual for users to start at TL3. The perks it grants are more for your members who understand how the day-to-day running of the forum works (eg. What topics go where, how your topic naming conventions work, what gets tagged with what, etc). In the normal course of events, people would be auto-promoted based on their recent participation, which is generally a good indicator that they know how you like things organised.
I think there is some talk of seperating this out and having something for TL3 and something for TL4, but there’s no timeline on this yet:
Though I think in your case it may be that you actually want your users to be TL2 and to just be participants rather than assist with organising and housekeeping?
