This is interesting, but it is really just the voting target with a couple of extra steps.

SO for example, lets say we set the amount of time required for a full power vote at 30 minutes, this would mean we could cast 48 votes per day at 100%, 96 at 50% etc etc.. this is the same operational effect as the vote target effecting voting power.

It would have the effect of preventing an inactvie user from casting his unused votes randomly (though i don't necessarily see that as a problem right now.)

But it would also penalize the pickier users.