Hey just to clear this up. What you are seeing in that video, is not what's happening on the server and for other clients.
If you edit your files like this, you will see the edited numbers in the armory and your character will seem like it is super fast and has 1000% swing speed or whatever. But the server only accepts realistic inputs from you and everyone around you (if their files are also not edited) will see it just like normal.
Thats also what i thougt but we tested this with group of people that has the exploit or not, has a low ping or high ping etc and made duel with each other. It makes people to spam better, fake faster, attack faster also kick better that normally you shouldn't able to with native files. I am not saying it makes swing 1000% faster etc it clearly gives players who is using it clear advantage. Normally peoples character size should be equal to realistic inputs but we saw giant ones smaller ones etc. "Normally server only accepts realistic inputs from everyone" but for that it didn't worked that way until it got fixed. from the tecnical part it looks like bull**** but it just works.
Quote from bug report.
Editing mpcharacters.xml and changing the stats of the classes seems to give you an advantage over other players. I thought local file editing is only client-sided but doing this actually seems to work. You seem to be able to swing faster in general and it doesn't feel client-sided because those hits sync up with the server. I think there are probably players already using it if this is true because you likely wondered sometimes how someone can seemingly hit 2.5x faster than you under the exact same circumstances. I found that it's pretty useless to change the crossbow and bow values because it basically forces you to reload the crossbow twice and when using a bow, it'll probably result in your arrow curving oddly.
I can't 100% confirm this exploit because I'm only 1 person and latency + server stability could have made it feel like it works. So, if others test this, maybe they'll have the same or different results.
How to Reproduce: Edit mpcharacters.xml and change the stats of the heroes. 200 might be the max you can increase it to and anything beyond that is pointless.
I am saying that again it does not makes your swing 1000% faster etc. But give players clear advantage. In a serious/ranked envoriment even 1 ms faster speed is important or any slightly advantage or even having a smaller character size (i know character size exploit got fixed saying it just to give example).