Proposed Sion Ult change

The Problem: Sion ult has very low turning, hits walls very easily, essentially useless unless you're charging down a lane.

The Proposed Change: Sion's ult is now only stopped by outer summoner rift walls (IE: Map Boundaries) and extremely thick walls (See: trying to run through Baron's wall all the way toward mid lane).

Sion, as he's charging, will charge through small walls. However, every wall Sion charges through restarts the scaling stun and damage of his ult.

What this does: It opens up Sion's avenues of ganking and doesn't punish as hard for things like accidently hitting broken turrets or scraping the corner of a wall. While it opens up these avenues, Sion's damage/Stun is still tied to how long he can charge without pause or halting. Trying to charge through the jungle all the way to bot lane will cause massively less damage and massively less stun than if he had charged through the lane.

Any feedback/ideas?