A lot of bugs. I can't say accurately. If something doesn't work, it's likely not your fault, but rather a bug in the emulator somewhere. Usually in such cases, it's better to re-test in a while to see if it has been fixed.
At this stage of development gamepads and controllers aren't officially supported. Check out PAD Settings for keyboard bindings.
At this stage of development gamepads and controllers aren't officially supported. Check out PAD Settings for keyboard bindings.