Teemo Mushroom Stack

With the incoming changes to Teemo, i twould be nice if we could take this opportunity to revisit Mushroom stacking and letting Teemo do it,

The 10 > 5 minute duration change is a huge 50% cut of the amount of map control Teemo can supply, the range increase doesn't entirely make up for it. In fact, now that he /can/ throw them at a range and use them in team-fights, map control Shrooming seems like it will come at a premium in this patch. So maybe we can add some more power in a way that is not.. toxic?

Instead of stacking damage, maybe if two or more shrooms are stacked on top of eachother, the explosion causes a knockback? I don't understand the bouncing effect and don't think this is necessary at all, just useless "power budgeting". Maybe Teemo can still be required to move directly to the mushroom to set another one on top, while ranged t hrows cause the bounce?