Ok, I see where I got confused!
My pump has an outlet that is built the same as Volenti's mod, but I have a direct drive / mag drive hybrid, so I assumed that all pumps were of similar design, and that Volenti's mod, which I didn't quite understand, well... ya'll know what, what's the point in explaining an illogical thought
In short, modding a pump is possible.
I'm thinking about adding a cover plate over my open rotor blades, with a hole in the middle, just to see if it'll throw water any better.