First of all, this are all terrible ideas. Toggle sprint does give players a lot of advantage at running away or during a battle, but this is also pretty dumb. Toggle sprint will not let you stop walking/running until you press that key, not many players will take the time to set their keys so that they can play better. Also, if you are on a bridge and you want to turn around for any reasons your character will not stop walking, it will just walk to the void. This also interferes when building a bridge, toggle sprint makes you walk ahead when building a bridge you almost never build backward or frontwards, unless you are me, of course.
See now there is a thing called "cutting somebody off". Who is gonna let somebody run away? It's easy to catch up to someone and it's not like they will have something that can just knock you off right away. If someone is running when they are in full iron or full diamond you should be patient. Wait for them to look in a different direction then rush them.
Yeah, don't be that guy. No one likes those people that will follow all the way to your base (If playing EggWars) just because you've some diamonds. It is very annoying and it is actually pointless, the other guy can just come again and again. Dumb strategy, it also upsets people a lot.
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Now, toggle sneak is just unfair. Think about it when you are in risk of someone breaking your egg and you want to push them off the bridge, there is just no way to stop them because they would stick to the bridge and then you are dead as an egg. (Get it? EggWars? Egg? Mkay, no)
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I don't see any harm on the Toggle Sneak and Toggle Sprint, it literally doesn't give any advantage to anybody...
I hope I also showed you why this mod should not be allowed by any chance.