I've had my P3 since the summer and to be truthful, I've not had enough flying to really use it properly.
I think my fields are set to:-
Speed
Distance to Next
Turn Left or Right,
working on the principle that if I know speed and distance, I can roughly work out Time to Next and I can add that to Wristwatch to give me my ETA.
Keeping the display fields constant between pages means that I don't have to keep flipping to & fro, looking for the right info.
I think the RoadMap is the page with the route in a black line and 'marker boards' at each waypoint. I quite like that page, you fly to the line and then follow it.
At the end of the day - what you show is a personal choice, there is so much information that its easy to drown in the data. As Whirly said, knowing how the 'Go-to' function works is a good idea
Mono - the airspace warnings are somewhere in 'settings' .