If any of you have used Valve's Hammer map editor, you will know what I'm talking about. It's a map editor that has 4 resizeable windows. It's like having a window with a fully adjustable Horizontal and Vertical split bar. You can set any of these windows to any of the 4 views: 3D, XY, XZ, and YZ. Although this is used to construct 3D maps, Filter Forge could easily take advantage of it. For example, What if you had 3 windows of the workspace, each at far corners of the tree, and one be of the preview! (The view options for each quadrant would be: Filter Tree, Node output, and Node controls.)
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Here's a picture of the editor.

Roses are #FF0000
Violets are #0000FF
All my base are belong to you.