Let Heimerdinger Upgrade! Towers

Heimerdinger has one niche above all else, and that's defense. Why can't he upgrade the one defense in the game with his ultimate?

It'll function as it always has, but with the added option to right click a tower to upgrade it for a few seconds. Here's an example of what it could do:

Upgrade!

At rank 1, Heimerdinger can reinforce towers providing them a shield that blocks it from spells (like Zigg's W) and provides 60/90/120 (+0.6 AP) for 10 seconds.

Rank 2 allows Heimerdinger to upgrade it's firing mechanism; giving the tower a laser defense system that deals constant, ramping up damage to it's target for 100/150/200 (+0.6 AP) (Max 500 Damage) for 10 seconds.

Rank 3 allows Heimerdinger to overcharge the tower's systems, creating a field of electromagnetic energy that shocks players in it's 950 radius every second for 10 seconds, dealing 80 (+0.6 AP) magic damage per shock.

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This way, Heimerdinger provides extra utility to a team when the enemy is sieging, because his turrets already have crap range and HP against ranged champions and groups.

C'mon, Riot, you know this yordle needs a boost.