gerzson6
It is good to know the FMS functions but when ATC asks you to do something you need to comply with it in a functional way. There will be no time to create another method and to ensure that it is also correct. FMGS PERF gives you enough info about your climb and descent profile to do the needful. pseudo way points are not created by pilot but are created by FMS as information about the profile aircraft will follow depending on variable factors like wind, temp, weight etc.