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I would not trust an interval to protect what you're trying to do. Users can still edit the number and type in whatever they want. Instead, I would add a second field that is the power level, and is calculated at 2x field[trtUser].value. Then, you're having the user control the number of points they spent, and displaying the final power level separately. (Or adjust the finalize script on trtUser to display the power level, but that might look odd if the user edits it when it says 4, because they'd see a 2).
I'd read up on the Savage Worlds Wiki - they do a similar thing where the user needs to control dice sizes, and they also need to only show even numbers to the user, but still have a single click change the die size from d4 to d6.
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