Really sorry, not sure I understand:
I just write /inputdevice = mouse
What do I then have to do with the mouse to get it to recognise 0 as a response?
You click on the <likert>'s button labeled 0? What am I missing?
Sorry, does this mean when answering the questionnaire respondents won't be able to press 0 on the keypad they will only be able to use the mouse?
Yes I understand now, sorry takes a while for things to sink in haha