This app was mentioned in 1 comment, with an average of 2.00 upvotes
You could use Voice Attack. It's $10 but once setup a profile you can then use your voice to give various pit commands, like "Right side tires only" Or "splash and go" or "Half can of fuel". Along with various other commands from having it text something in the chat box to having it switch your F screens. Pretty handy tool. https://www.voiceattack.com/
Or if you have andriod tablet can use iRaceDash which allows you to select various pit options. https://play.google.com/store/apps/details?id=com.mydigitalimagination.iracedash&hl=en