Idea for Kog'Maw (current version)

The main complaint about Kog'Maw currently is that when he casts W, he is supposed to right click and idle while his massive DPS clears the entire enemy team.

Because of this massive attack speed, you can't use mechanically difficult tactics like kiting because every step you make is a loss of DPS.

What if, instead of reverting him to pre-rework, you allow him to move while auto attacking during his W? As a pay-off, his movement speed is reduced by 50% for the duration. (self slow can be increased, maybe even 70% would be more fitting)

In practise, this will mean that Kogmaw will automatically keep auto attacking and even moving away wouldn't stop him, unless you use the hold position/stop attack button. You can still switch targets by clicking on them.

I think that the ability to move while AAing would give this machine gun a bit of a higher skillcap. Obviously his damage would have to be nerfed to compensate.

I know that this is unlikely to still happen after he has been rerolled to pre-rework, but I just wanted to know what other people think. Do you think this would be an improvement? Better than current state? Better than pre-rework?