Lock flight plans

Hi, I know this flight plan lock feature has been requested by others, but it was long ago. I just want to bring it up again. This feature is quite important for me too as I have many routine flight plans need to lock, so that they can’t be move, edit or delete easily. Especially on touch screen devices, accidental touch could destroy the perfect flight plan !!! Getting more annoyed if I go somewhere far and rural, the flight plan goes wrong just by a bit, not complete and just noticed after upload.