Sliders, and why racing games need them
A button is on or off, but a slider gives you everything in between. Slide your thumb up the track and the input ramps up smoothly, so you can ease into a corner instead of just flooring it.
The one I use most is the combined throttle and brake slider in the racing layouts. Push up for gas, pull down for brake, and there's a little buzz in the middle so you can find neutral without looking down. Real partial throttle on a phone!
Sliders aren't only for pedals, either. Anything a game wants as a smooth amount instead of a yes or no is a good fit, and you can drop one into your own layout in theeditor.
You can also shape how a slider responds, so the middle of the track isn't twitchy and the ends still reach all the way to full. Here's the short version in video.
Want to try it?QR Controller is on Steam and the racing layouts ship with the throttle and brake slider built in. Friends scan a QR code and they're driving.