LCD should show actual feed rate.
This would be nice to have this feature to display actual feed rate.
This will help to tune up the speed of hot end.
For example you can change speed in slic3r for infill 60 and also you can speed up or slow dawn in computer up 300%.
But you don't actual speed at the moment, for this you need all the use calculator.
If you can see on display you can easy adjust speed in slic3r.