New features/instruments for Vertex Color Paint

Here's the situation: I want to use Vertex color in my material, also I bake AO to it.

So I bake the AO to VC, and then with shift+k I want to paint needed faces into needed colors. Obviously, for now this only will re-paint everything. What I ask is to add some extra operations for shift+k: like Multiply, Add and orhers - with the possibility to scroll-control them. Or so shift+w can copy brush settings. I can't say which way would be more convenient, but this VC upgrade could save a lot of time in some situations.

So, if it'll just copy brush settings, in the situation showed below I am thinking aout this behaviour of Shift+K operation:: selected faces will be multiplied with red color by factor 0.5, instead of changing it completely into red.

So the result will look like that:

(sorry, couldn't find how to work with images properly)