Teemo Rework Idea

Okay, Teemo's w is probably the worst ability in the game. Along with Teemo having no main role. He is squishy and can have high damage output like an assassin, but his w lacks in-combat mobility. He has no self-peel and high-mobility chanpions easily counter him. Teemo is really only good in lane where the enemy is forced to take your harass to CS, and when he is really ahead in gold. His lack of mobility makes it easy to target him in teamfights with CC. Any jungler of laner with CC can easily shut down a Teemo, which makes him too unreliable. He relies on flash too much as a gap closer. To make up for movement speed, which you shouldn't add to teemo unless the w ms is removed. A suggestion would be instead of attack speed when he enters passive, he could instead charge up his next autos to do bonus damage and slow. To provide Teemo more sustain, replacing w with "Heal for X amount of health while you are in your passive, this doesn't unstealth you". This would make a great ability for Teemo as if you are losing lane, you can stay longer and grab cs and xp, and when you are ahead it allows you to roam and place shrooms instead of healing up at base. I don't want to buff teemo so much that he becomes unstoppable with damage and life steal, but adding more sustain in lane so he can keep up against really poor matchups, or making him have an impact on the game earlier with his shrooms. Right now, its hard to help the team early because he lacks mobility to roam to the river or lanes to place shrooms and have map control, you instead have to wait in lane and let fight come to you. I would like teemo to be either a 'bush' assassin or a support-like champion with map control.