In fact I was expecting a scrolling menu you can elaborate choosing yourself, in the "Preferences" the softs you have on your computer and you want to use. (I have some softs on my computer I don't use in my main works). The last choice you've done will automatically stay in place till you change it. And eventually you can change this previous proposal choice with the right click or some other key when you've selected a picture you want to edit?
Sure, it's less automatic, but it could let you a different choice depending of many factors for the same type of file. And I like to be free in my choices, and not dependent of an rigid automatism. ;~)
Is my explanation understandable?