dual remotes

I had an incident the other day that convinced me that for some jobs I need a second (camera) operator. My questions: -- Which remote would/could/should manage third party flight software (Litchi, AutoFlight, etc) for setting up waypoints etc on site or in flight? -- Is it possible for the...

I hope this isn't a dumb question (I did search but couldn't find an answer). As the title suggests - is it possible to share the slave remote between two Inspire 1's? I currently have an Inspire 1 with dual remotes and I am thinking of getting an additional Inspire 1 pro and ideally don't want...