This addon automatically switches to your last active flying mount while the race countdown is running. So you do not have to do it manually every time.
Because when you start a skyriding race not already mounted, you automatically mount the Renewed Proto-Drake. There is currently no way to pick a default mount to race on.
(It is not possible to change to your last mount right away. We have to sit and wait on the Renewed Proto-Drake for 2 seconds before the switch. Otherwise the game automatically switches back to the Proto-Drake.)
(Unfortunately we cannot automatically switch to Druid flight form, as the respective API function for shapeshift cannot be called from within addons. Sorry.)