Adjusting the spindle RPM and Feedrate on the fly as we machine parts is very important to avoid chatter and tool failure. Adding Spindle RPM and Feedrate Adjustment Sliders to the F2 screen makes perfect sense to me as well. You might want to consider this as a valid option.
I agree with Stephen on this also. Many machine manufacturers use the mpg wheel to adjust rpm and feed speeds while simultaneously running a program. There is usually a button that says hand control spindle, or feed, and then the wheel takes over. Nice to be able to turn the wheel back and forth while cutting to help prevent chatter.
To use the Feedrate override press F11 and then use the MPG to increase or decrease the Feedrate. Note you cannot exceed 100%
This works great to change speed on the fly and is something I use quite a bit. Using the MPG is far easier than the + & - keys.
The same is true of Speed override.
To use the Speed override press F12 and then use the MPG to increase or decrease the Feedrate. Note you cannot exceed 100%
Please note that when you go back to Jog mode you need to select the axis you want to override the current override mode. If you are on the X axis ans want to jog the X axis you need to change to another axis and back again.
Spindle override and Feedrate override are mentioned in the keyboard shortcuts though it does not specifically mention the use of the MPG as one way of changing the value.
I recognize that the documentation it needs more work