I feel like I'm suffering for Peter Molyneux's sins. (The gesture recognition system in Black&White, which was clearly Cool, and equally clearly Not A Good Idea. The Darwinia people seem to have learned half the lesson...)
The interface would be just as clear, and twice as usable, if the Task Manager came up with a row of buttons to start various programs. There's plenty of room for them. The whole reason gesture systems were invented was to add more interface options without requiring an extra mode button/key. In this game, you're using the Option key anyway.
I'm particularly annoyed because I have an old Mac ("only" 933 MHz G4, moderately wimpy 3D card). The Yard drops down to 8-10 fps... or 3-4 if I manage to take out an anthill and the CPU is temporarily occupied with hundreds of drifting souls.
I could play the game at 3-4 fps. It wouldn't be a pulse-pounder, but I could make progress. Except the gesture system chokes, and I simply can't create any new squads until all the souls have drifted away. I'd pay extra for a row of buttons, honest.