This has been requested a lot over the years since I started using iFly. Here are a couple of my personal use cases for this. There were two split screen combinations I loved on my old long defunct Lowrance. The first was a split of (i) map view and (ii) profile view. This was awesome as I approached complex airspace or coming back to Hartford where I wanted to watch my decent in profile view to see that I would clear the ridge and get under an airspace shelf etc. Really let me manage a decent. The second one I really liked was just two maps (i) One at normal en-route zoom range and (ii) the second zoomed in on the destination airport so that I could see the runways with my course line coming into it to help picture in advance how I'd manage my arrival to unfamiliar airports and runways;
Another very old wish list item that's been hanging out there a long time - a way to fly a radial from a VOR such that it sends that as the course in the NMEA output. i.e. how to intersect or track an outbound radial (not specifically to a waypoint) and feed that to the autopilot.
Anyway, I'd like to add my voice to the split screen idea :-)