I frankly don't know if it's possible or not. It would probably require manual manipulation of the player data base, and I'm not sure it would be worth the return on the investment. Hblair, Brady, and I had a discussion a short time ago, where I broached a suggestion Buhdman made to reset perk points every other week, instead of once a week. The consensus was that this was not desireable. While it would help the low-hours CT player a little, it would still mean too many superplanes (piloted mostly by the high-hour CT players) wreaking havoc on the newbies and low-hour crowd.
Of course, that was talking about a complete reset of perks, rather than the "residual perk point" reset you suggest, Eskimo. It's worth thinking about, if it can be done without major code work. Still, I wonder if it would be worth the effort. I guess my first thought is that those who have a lot of points left over at the end of the week probably earn them pretty quickly. For those that don't, this wouldn't help them much. I'd be interested in hearing from others on their view of this idea.