I was just discussing with a friend about how to adapt a 2d20 advantage/disadvantage system from D&D5e into Pathfinder, and we realized that with R20 rolls as they are, it would slow down the game a great deal. For example, attempting a long string of attacks, like Monks are capable of, we would have to roll 2d20, take the better die and then 'manually' add the total attack bonus to get the final result. As opposed to being able to roll 1d20+x and have the total automatically calculated. Dice roll syntax to automatically take better or worse would allieviate this a great deal. For example, /r 2d20tb+17 might roll 2d20, take the better result, add 17 to it and put out the total automatically. 2d20tw+17 would take the worse result and add 17. By adding the tw or tb syntax to the specific roll, as well, it could, at least theoretically without knowing how the code works at all, allow combining tb/tw rolls and non-tb/tw rolls in one roll string. Example: 2d20tw+3d6+17 would roll 2d20(17, 8), take worse result(8), roll 3d6(3, 5, 1), add 17 to the worse d20(8) and result of 3d6 combined(9) for a final total(8+9+17=34).
