Next   beta will come with a new temperature input dialog .

Next gcodeprintr beta will come with a new temperature input dialog .
Controlling the temperature using a slider can be quick and easy, but if you want to set the temperature to an exact value it is sometimes hard to find the correct position. GCodePrintr will now open a temperature input dialog when you move the slider to the max position. This allows you to enter the exact temperature very quick.

http://gcodeprintr.dietzm.de/beta.html