Teemo Stealth mechanic: Following in Evelynn's wake

So, Evelynn has recently (I think) received some buffs to her stealth mechanic. Mainly, she can go in and out of stealth a lot faster at the end of game. Now Teemo as of late has not seen much love, primarily because his mushrooms, while still useful, have been nerfed enough that they aren't nearly as threatening as they once were, and his burst potential is limited.

One of the things that makes Teemo unique is his ability to hide in stealth when he sits still long enough. What do you all think about buffing Teemo's stealth mechanic as well? It would give him a buff to his decision-making capabilities without directly buffing his numbers and still give people ways to work around him. It would also increase his survivability and, in my opinion, help define what makes Teemo the annoying little abomination that he is.

Numbers-wise, maybe just have his stealth cooldown lower at levels 5, 10, and 15.

Thoughts?