Opera off-road mode: Automatically switch on for mobile but off for wifi

I like Opera's off-road mode, especially the fact that I can disable loading images specifically for it, but when on WiFi, I have to manually disable it, which is an extra step. Is it possible to set Opera to use off-road mode for mobile data, but switch it off when on WiFi? Note: I've tagged this with Opera Mobile because only Opera Mobile and Opera Mini tags are available, but I'm talking about Opera for Android.