Idea for Obake's final mission: Mid-mission, you get cut off from command. You're going up against impossible odds. You're fucked. When you get cut off, the music stops and is replaced with white noise. This continues until the level is over, or whenever comms are restored.
The goal of this is to make the player really feel like they're fucked. It will be hard. Very hard. But if the player can push through the barrage of bullets and defeat the immense force, they will feel an incredible sense of relaxation.
I might want to expand on this a bit. Mention it on IRC, and possibly with William on GTalk if he doesn't join the chat.
Another idea; Faptau saves the day by being the only Tau actually good at melee. All that wanking did some good, I guess.