[Alan Anderson]

In LabVIEW, what you want to do is pretty easy. You only want to change the value being sent to the motor controller when a button is pressed, right? You want the motor to keep turning in whatever direction it was turning when you let go of the button, right?

Use a Case block wired to the button value. In the True case, set the motor to whatever value you want. Leave the False case empty. Use another similar Case block for the other button. This will do what you asked for. You will want to avoid pressing both buttons at the same time, because what the motor does might not be predictable.

It won't give you a way to turn off the motor, though. This might be okay, or you might need to rethink your requirements.