I assign one session per band/project. I haven't had to switch whole sessions between songs, just FX chains. I give the chain the same name as the song, save it to the H9000, and drag it in when I need it.
The plug-in currently gives DAWs control of FX chain bypass, mute, mix, in gain, out gain, and functions, but it does not support swapping sessions, chains, or algorithms.
Once Emote supports scenes then DAWs will be able to swap sessions through Emote.