The add-on will force the player to stand up if an action is taken to display the error "You have to be standing to do that".
While sitting you need to press the action that displayed the error 2 times. The first time will force the player to stand and the second performs the action..
I made this while leveling on my mage and was doing the conjure water/food cycle. Found it a pain to keep manually standing after drinking to conjure more water..