i finally landed a switch tre yesterday! it wasn't the best one ever, but it kind of broke down the thought barrier of not believing it was possible.
not that i can do them all every single try, but i have now done in all stances (at least once) shove-its, kickflips, heelflips, bs and fs kickflips/heelflips, varial kickflips/heelflips, inward heels, hardflips and tre flips.
not sure that i'll ever do switch and nollie impossibles, switch bigspins, switch bigflips etc. but i'm pretty satisfied with the list above.