Percentage value for one-time FP Cost limitation?
How would you price a limitation for a variant of Costs FP that only imposes the fatigue cost once, on activating the ability, and does not include a maintenance cost?
Obviously, this would not be applicable to abilities you could just pay for once and leave on for the rest of your life, but assuming the ability shuts down when you sleep or get knocked out, like Alternate Form, or that has a Maximum Duration?
I'm leaning towards just halving the limitation value, so 2 FP is worth -5%. Is there a precedent or semi-official ruling about such a limitation?
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