Thanks for looking at Android (Beta)!
The initial dialog (which only appears if Android Studio is not installed in the default location) does show a prompt in the folder selector on Mac, but apparently not on Windows or Linux. I’ll add a separate one for that.
No, Genymotion is not yet supported. We have to start somewhere and using the standard Emulator made the most sense.
Like with iOS with Xcode, we do require a full Android Studio install. I suspect that will change over time, but pinpointing all the independent correct pieces to grab and install is not something we have done yet.
The Android Debug Bridge does not like to share its connection so it is easiest to keep Android Studio closed as it tries to grab the connection. There is a preference switch in Android Studio that can work around that, but you have to toggle it back and forth should you actually want to use Android Studio.
Don’t expect control sets as they are also not on iOS. I don’t think they are on web either.