I mean,
I think the most relevant one would be a 'ready to start' state, with all electrical, hydraulic, and fuel pump systems set for start such that only the auto-start procedure is left to the player. I'm not sure if APU's should be left to the player or not, I don't know if they are only used for start and how often the 225 has access to ground power, your discretion there.
This is mostly to adress how long it can take to setup a flight plan on the 530.
You could also fork the currently available state into 'ready to taxi' and 'ready for takeoff', where flaps, speedbrakes, and ext. lights are set accordingly, but this is much more miscelaneous.