The most annoying thing about Banner of Command. Also, Ohmwrecker...

Is that I'll want to use it on a particular wave (one with a cannon minion) in a lane that needs it, but I'm on the opposite side of the map when that wave spawns and it'll take me 45 seconds to recall and catch up to it :(

Would it be that OP to just give Banner a global cast range? I think it'd be worth considering a run on the PBE.

There's also the less-than-popular Ohmwrecker to discuss. It's better to get something with superior stats and just take turrets when they are open rather than diving one that would otherwise kill you without the Ohmwrecker. I think it'd make a good Support item, but it'd need more functionality than what it has.

My proposal has always been that it can also be used to empower your own turrets, so that it can be utilized while on the defensive as well as when attacking; if you pick it up and are being pushed hard you might lose before ever getting to use it.

While we could do something incredibly simple like increasing the turret's attack speed or damage, I think it'd be way more cool to have your champion "hop in" the turret and take control of it, protecting themselves and picking the target (ignore the tank, waste that ADC).