It'd be nice to have the option of maintaining or otherwise controlling the virtual game console's aspect ratio. My poor chunky pixels can get easily distorted if I'm not careful and it seems there's no easy way to lock or reset the window back to a proper aspect ratio/resolution should you accidentally resize it in an unusual way.
Additionally it would probably be very useful to have the option of multiplying the window resolution by a few intervals (2x - 8x?) of the native "console" resolution.
I don't know if something like this is being addressed in the next update's bug fixes for the UI. If not though, it'd be appreciated to see this on the road in the near-future.