That an interesting subject. I like this model of programming. Object Selection with command based coding. It allows a lot of avoidance of syntax errors and is usually clearer to notice errors.
After using C2 coding model for a while. I checked up with other VPL(Visual Programming Language) and found they are visual node base. Similar to flow charts. After looking at some of the work. I can't imagine any robust game using visual nodes. It looks like it can get very unwieldy quickly.
Saying that however, I have purchased uScript and Playmaker for Unity. Playmaker is more VPL. It looks from what I can tell that Playmaker is while visual node base. Is also more traditionally Object structured in presentation than C2. Which means that it should be possible, but you should be very, very careful with your structure.
I personally don't think C2 should not go visual nodes. I don't believe it adds a whole lot. I find C2 Eventsheet a wonderful balance. I wouldn't mind a little more Object presentation structure like GMS. Where I can click on my Sprite Object then I'm shown all the Sprites Events; rather than click on a sheet.
.... that might be interesting. EventSheets hidden and orientated to the an Object directly. So clicking on PlayerSprite would bring up the PlayerEventSheet. I sorta like that :D but not needed :P