Yeah, I had to change a few Hotas settings to be able to explore the map easier, but I still forget what they are at times.
I don't think there is a technical reason for not being able to map certain controls (SRV and FSS etc) to the DS4 and flight controls to the HOTAS. It's just that Frontier haven't put an effort in to implement it, which leaves us PS4 players who invested in the HOTAS at an enormous disadvantage compared to PC players who are able to use HOTAS, gamepads and keyboards and mice all at the same time.
A lot of players want space-legs, atmospheric planets etc... the two things I really want from Elite are crossplay and this.