I have the TT2L and its great for almost any task. The flood is bright enough for most things, esp walking etc, but the incan beam is not a long distance thrower. It throws a decent distance, but nowhere near the G2 or 6P. Plus the incan is not exactly focusable (even though it says focusable) so the beam sorta floods a litte.
Damelas, there is no off the shelf tailcap pushbutton for the TT, but one of our esteemed modders McGizmo has done a mod like that before. AFAIK its not made nor sold commercially so you might have to try modding it yourself if you have the tools! I'll have to see if I can find that thread again...