Change value Slow or Fast

[solrac3f]

Hello,
first of all, I would like to say that this Menu with Encoder is very good and thank you for sharing it.
I am some kind of beginner in c++. That is why I come here to ask for help.

I think it would be nice to have the possibility to change the values in the Submenu depending on the speed that the encoder is turning.

What I mean is. If turning the encoder slow it would encrease or decrease the value by 1. If turning fast it would change the value by 10 for example.

I would make the following change in the code as follow.

"
// demonstration enter a value
void value1() {
  resetMenu();                        
  menuMode = value;                    
  oledMenu.menuTitle = "demo_value";     
  oledMenu.mValueLow = 0;               
  oledMenu.mValueHigh = 100;        
If (slow_fast== 0) {     
  oledMenu.mValueStep = 1;            
}  
  If (slow_fast== 1) {     
  oledMenu.mValueStep = 10;            
}  
  oledMenu.mValueEntered = 50;           
}
"
Only I don't know, where and how I could change inside the code the variable slow_fast from state 1 or 0.

I would appreciate your point of view and thanks in advance for some help.