Matrix multiple choice : Can the customer delete his/her choice?

Matrix multiple choice : Can the customer delete his/her choice?

Hi, 

As we are testing our survey, we noticed that it is not possible to double click on the dot of a column/row in order to delete it. In that sense when a customer fill the form, it is not possible to delete the answer from the moment that there is a clic.

Is there any way of enable a function to make that possible ? Otherwise, is there any other way to create multiple matrix that integrate that issue ?

Thank you!
Julie