Tranquility is not available as a Click-Casting spell under spells

Also, when trying to set "T" as a button to use, it sets it to "Talent" instead of "T" (see on the left: https://imgur.com/EAR2MDa)

An option to have custom sorting would be nice too :) Some people prefer to have tank at top, dps in middle and healer at bottom for example.

Fixed wrong display of key bindings.
Spells like Tranquility are not included in Cell. But you can add it manually by selecting spell->edit and filling in the spell name.

I'm afraid there's no plan to add more sorting methods at the moment.