Button Box

Since JRT v1.57.9.1, you can add buttons on a dashboard page to simulate a button box. There is different type of buttons that you can add :

Key combination

You can create buttons that simulate the keyboard. For example, you can simulate the Alt+K command.

Chat / Macro

You can create buttons that write directly in the iRacing Chat, so can say "Hello Everyone" for example by pressing the button, or send the Macro #!lf !lr !rf !rr to tell iRacing to toggle the tires.

vJoy Device

For this type of buttons, you will need to install the vJoy driver v2.2.2 to simulate a new device on your computer. After the installation you can open vJoy Conf to add a device that can contains up to 128 buttons.
Once the vJoy device is installed, open the JRT server, go in 'JRT Config / Virtual Buttonbox', activate vJoy and select the device number you want to use for JRT.
You are now ready to add vJoy buttons on you dashboard that you can use for the JRT, iRacing or other Games keybinds options.

Note that there is two different modes for the vJoy buttons. If you need for example a 'push to talk' button, choose the Standard mode and if you want the command to be repeated when holding the button, choose the Hold-to-repaet mode.

Here is a video that shows you the creation of a small button box :

Here is another video that shows you the creation of buttonbox with 40 buttons using a model :