Cant do that with proof of brain since the reward pool is based upon votes done in a certain period of time.
There are some projects that are starting to implement tipping which will allow people to continue to reward authors for their efforts.
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I imagine there are multiple ways to achieve an indefinite voting window for posts (with payouts still occurring every 7 days). We just have to think more about how to do it. Khal was talking about doing it. And there was one other frontend which relied on automatically making a new comment from the post author's account so that a vote on the post would actually be cast on that new comment, but on the frontend it shows like you upvoted the post and it pays out after 7 days (no matter how old the post is).
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Let's not forget that @howo is adding recurring payments in HF25. That's another way.
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