Another "nice to have" would be an Emergency Button or Tab which when activiated would show all (or any) airfields that are in gliding distance of your current position/height, taking into account winds etc. If a Tab it would show all required relevant airfield info, runways available, surface, lengths, airfield frequencies, blah blah, nothing like being armed with information to make the best possible decision in a high stress situation. As I say a nice to have