I know that dash systems are pretty easy. So this is for anyone that is new and hasn't played around with rpg maker much. Plus I've added two speeds to the system. Ok the first thing we are gonna want to do is to make a common. Set it to parallel and name it dash system or whatever you'de like. It should look a little like this.
Going by this you can press y also known as s on your keyboard to slightly speed up. Pressing y (s) again will make you go super fast and finally pressing it a third time will bring you back to normal.
You could also add a sneek system in there simply by adding another button pushed like z (d) and that could minus 1 to the variable with a negative 1 being speed 3 and -2 being speed 2 and so on.
I hope this was helpfull to someone and if you have any requests for system I'll try my best to make them. As long as it's not scripting that is.