Recharging Sightstones

Backing in League of Legends is a chore, but necessary for item purchases and health/mana replenishment. Supports have low gold income and many have efficient sustain, so backing for these reasons is unsatisfying, yet they have to back anyway to recharge their Sightstones; which is important, but especially dull.

I think it would be cool if Sightstones had a ward recharging system, to reward supports who manage their resources effectively and back only when they can afford key items. This would also encourage warding, make ward placement more forgiving, and allow for more extensive roaming, all of which adds to the fun of a role that has less compelling reasons to back and is more rewarded for staying on the map.

I can understand if people don't think supports and vision need this kind of buff, or think that this makes vision play too forgiving, so I'd be fine with Sightstones having less initial charges (say, 2) and a modest recharge rate. The recharge could be based on time, kills/assists, distance traveled, who knows. This idea would be tricky to implement, but I'm curious what people think about it.