I really can't see this as cheating.
It is no more of a visual aid than simply using Avatar movements.
Remember Nivlac's / WGTNiv's putting guide? The basis for that guide is.. you guessed it... AVATAR MOVEMENTS!
This just puts lines on your screen so you don't have to futz about finding those built in notches in the meter.
If this is cheating, then so are using avatar movements, heck if this cheating, simply trying to find some percentage visually on the screen is cheating.
It's a nice guide. It is simply showing an elegant, yet techy way do accomplish something that 70% of all players do anyways.
*for disclosure, I use avatar movements, and sometimes a calculator when I play this game.