2. VPE Preference page should contain checkbox with choice: "Always ask" otherwise user will never be able to get dialog asking to choose between JSF and HTML5 support once he will check check box "Do not show this message again"
4. With GTK3 "Visual Editor Browser Engine" group within VPE prefrences page is hidden it would be more user friendly just disable it and add some label why it's disabled?.The same way as selecting of GTK for BrowserSim/CordovaSim works.