Grab and Release?

I just noticed these menu items and cant find any documentation on them…what are they for?

just guessing it might have to do with taking over GCS control from another portable device?

It would be really nice if changing the default altitude (in checklist prior to connecting) would be persistent and not reset every cold start of the app…
also, for it to be used in the default takeoff command instead of 10m…why have it affect other waypoints, but not the takeoff button?