Small update for Shyvana

So I am a pretty new player, but I'm not really new to games in general. My first love in this game was Shyvana (recently having played Hyrule Warriors I was enjoying the likeness to Volga), and I've always loved dragon based characters.

Anyway, enough about me. In the start it was easy to win as Shyvana. Not because she was amazing at everything, but because I was playing with new people that, like me, didn't know how to play. I did Shyvana in lanes, doing ADC as her (was fun with the low level people) but as I got going against higher skilled players it didn't work well. Shyvana is still a great jungler, but doesn't do much for laning.

Even in the jungle Shyvana can be difficult because while you can jump into a lane quickly, there's nothing stopping anyone from getting out, and you can't do enough damage to help, all you can really do is tank when people want ganks.

Small changes can make someone OP very fast, and I don't want anything major done, I'm asking for something really simple: Update Shyvana's passive to steal movement speed, and here's how it can work:

> Dragon's Fury: Each ability adds 1 stack on hit, up to a maximum of 5 stacks. Steals 1% movement speed per stack.

All Shyvana's abilities add 1 stack to champions on hit, up to a maximum of 5 stacks, each stack slows movement speed by 1% and drops off after 2.5 seconds. Shyvana also gets 1 stack per hit up to a maximum of 5, this way there's nothing more than 5% speed bonus. Each stack dropping after 2.5 seconds means that Shyvana must do continuous damage with abilities for this to be effective, and can only reach 5% speed stolen if hitting with 5 abilities in 2.5 seconds.

This change wouldn't affect jungling and should only give a minor advantage in laning, which would put Shyvana back on track to be viable as a top Champ.

What do you all think? Is this a minor enough change to be viable without pushing too far?

Edit: Doing some checking on it to see times. Burnout is 1 hit per second, so in 2 seconds you have 2 stacks there, +1 from twin-bite, +1 from flame breath giving 4 stacks in 2 seconds with all abilities used and several seconds before more can be done.

In dragon form there would be additional stack from the initial cast (if hit) and then stacks from the scorched earth. In total a 5 stack maximum on a champion would be only if all abilities hit within a few seconds and keeps Shyvana as an all-in type of attack or help with a sustained chase.

This would come in the biggest help in team fights where Shyvana could slow the entire group, hopefully just enough to turn the fight, but not too much that it would dominate. And not giving stacks from basic attacks, or stacks on monsters or minions, this update would solely affect champion fights, and give nearly no bonus in early game.

Edit 2 - pulled from a comment:

Looking at it, this would only give a 5% speed buff for Shyvana and 5% speed loss for the champion(s) for 2.5 seconds before stacks start to drop off. Items typically give more than 5%, and 5% of 400 points of speed is only 20 points, while most abilities are 30-60 points of speed flat out. On top of that, the 5% is a maximum, and it would be sustained at only 2-3%, nothing major but enough to give an edge at times.