I fly both powered aircraft and gliders. For gliding it would be good to be able to use the glidesafe function and also be able to specify a safety margin i.e. circuit height at which one would wish to arrive back at the site / plan a circuit into a field. Power pilots may wish to use this for an added safety margin too. Obviously sophisticated gliding specific software exists but this would be a simple but  useful feature for leisure pilots. Also it would be good to be able to define an aircraft as a glider type and not have to fill in irrelevant fields e.g. fuel