Agreed if we do see abuse we will begin to look into something that you suggested it is very similar to how we calculate Shadow Rank increases already (moving averages). We do not discourage manual voting, we only encourage to maintain an average Voting Power that is relatively high (over 92%). As you pointed out this update directly effects each member based on their contribution to the pool based on voting power, which means those who give more votes get more. This allows those who wish to vote a little more to go out and get that and still be part of the ShadowBot system while when they are not voting maybe on vacation to reap the rewards of the system fully by having their Voting Power and thereby Pool Priority go up! We feel this is the closest system we have so far that aligns with what the white paper and concept of steem is!