Turret/Inhibitor Kill Credit

It seems to me like getting the last hit isn't exactly the best means to determine who gets kill credit for taking these objectives (Which is a factor in your grade and as such obtaining a chest/mastery level). I suggest it be revised to give credit to who ever did the most damage to the turret within the past 10 seconds. This way if you're working as a team to take down a turret the proper credit is given but it doesn't take credit away from someone who sneaks off to take a turret that's been sitting 2 AA's away from death for 4 minutes.

This wouldn't apply to dragons/baron since those require last hit to give your team the buff and the last hit is arguably the most important.

EDIT: Also can we please get a "damage to structures" stat??