Cemu actually recognizes even my Wii Remotes (which I paired up via Dolphin); unfortunately though, it doesn't seem like buttons can be bound to them...
I don't know what people were talking about regarding performance in 1.5.0 . Everything I test is at least as fast as before, some even faster, e.g. Super Mario 3D World (now even those parts where you have a far view through the level are at full speed). Maybe the perf. regression is only for AMD users?
Loading times have risen, though. Especially in Mario Kart 8.