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I think Duggan's idea is right. Let's say that I added an "allow 0 ranks" extra, that let you take a specific power down to 0 ranks, that would cost 0 points (since it wouldn't have any effects). The idea would be that other powers in devices / arrays / etc could "stack with" it, to boost it up from 0 ranks.
You'd be able to add power extras / flaws to such powers, but it'd be up to the player to make sure that the powers they "stacked with" had the same extras & flaws; it would be difficult for Hero Lab to validate for you.
Would that be a useful feature to add?
Nigel: You make a good point, but these powers would do nothing at all until something "stacked with" them or otherwise boosted them. So it'd be OK for them to cost 0, since they effectively don't exist (and have no effect) unless something stacks with them. They probably wouldn't appear in output, for example.
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