I know this isn't the answer you were hoping for...but I hope the above helps!
Actually you can customize the widths to any size you want, but you have to know (and be able to control) the HTML document where the survey is going to be kept, and the CSS.
I always remove the style call from Emma's downloadable code and add my own CSS to control these elements since the default style is very large and a little ugly. Sorry Emma.
It also helps if you have the "web developer toolbar" for Firefox or Chrome since this will let you see the "generated code" that you will manipulate with CSS. With my approach, I have also been able to hide all of the elements I want and change the layout completely.
Now if they will only remove the target="_new" which should actually be target="_blank" from the form element, I would be much happier. I hate having to hack their code.
I know this is an old post, but If you want more detail you can email me at email@example.com.