Smite in others lanes

Currently the Smite is very strong and viable for the other lines.

Thinking about it, a solution would be to increase the cooldown of this skill and every killing of jungle monsters will reduce the time to reuse this spell.

For example:

Crimson Raptor: -2s of Cooldown Raptor: -1s (-3s the three) of CD

Greater Murk Wolf: -2s of CD Murk Wolf: -1s (2s the two) of CD

Ancient Krug: -2s of CD Krug: -1s of CD

Gromp: -3s of CD

Rift Scuttler: -3s of CD

Blue Sentinel: -3s of CD Sentry: -1s (2s the two) of CD

Red Brambleback: -3s of CD Cinderling: -1s (2s the two) of CD

Dragon: -5s of CD

Baron Nashor: -5s of CD

This is just an idea, I wonder the opnion of you and how it might best be applied to the game