Honestly, I've been thinking about it and I think a better way to go about this would be, to have a notification telling them about the new user setting & linking to relevant User Control Panel section.
Let the user turn it on/off via their User Control Panel (have it off by default). Next, just have a box that says, "would you like to contribute cpu while you browse [forum name]?", with a yes/no option.
Then they can select how much to contribute via a dropdown box with increments of 10.
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