In the multinum question the default width of the input is 12 colums, which leaves a very small width for the subquestion. Since I have never needed a numerical answer that would span 12 columns, I would like to ask for a more sensible default here.

I realise that all sizes are artitrary, but I would suggest 6 columns for the label and 6 columns for the input field.

Having said that, I think I would also be more sensible to have the user specify the width of the label/subquestion, and not of the input field. Normally the label/subquestion width is much more dynamic within surveys than the width of a numerical input field.