I made this lovely underwater base using the RFTools builder. Making it went fairly quick but then when i wanted to drain the dome i came across a problem: How the hell do i drain it?

So i suggest we either get filled dome shapes or get one to three buttons that let us decide how the shape should be filled:
Outline Button - Would build shapes like Boxes just build the edges.
Side Button - Just build the sides of a shape. Excluding edges.
Fill Button - What it says on the tin, builds what the Shape\Outline button doesn't build.

Maybe a shape that let us "drain" or replace blocks could work too :P. With the dimensions telling how far it can seek.