The green can be very difficult to see. Even a thin black or white outline around the green boxes would make visibility much better on certain maps.
I was just about to suggest a colour blind mode before I saw this, figured I should post here instead. Sometimes for me (and I imagine other people like me) it can be hard to see the area of effect of a lot of things. The two most used colours seem to be red and green but they are also the ones that people most commonly have problems with. Being able to customize the colours, or even just making them darker or more opaque would really help.
