Hi mate,
Thank you for the suggestions!
At the moment, the translations modes that the app offers, are not intended to be used on many types of different areas at once (i.e. fullscreen). However, I do plan on adding the ability to select several areas that translate simultaneously. Which would solve your issue.
Regarding the last question - this is already the standard option for the app. Maybe you have selected 'High Contrast' in the Font tab? The text colour algorithm I have implemented is not perfect, so it will sometimes fail.
Unless you were talking about the 'Manual mode'?