qtemu does not support different image-formats. It also creates raw-images. They are to big. It should be create qcow2-format as default or should over all available formats (behind a advanced-button).
Logged In: YES user_id=1544376 Originator: NO
This could be a feature for a next version.
Logged In: YES
user_id=1544376
Originator: NO
This could be a feature for a next version.