It's probably not a reasonable question. But it would be too cool if a layout could grow to fill the browser window. I currently open IWP in a carefully sized browser window so user's don't have to scroll to see the whole layout on lower resolution computers. It would be nice if those with higher resolution systems could benefit from increasing the size of the window.

Unfortunately IWP does not support the auto resizable layout objects. However with CWP its pretty easy.

Custom Web Publishing is much more powerful then IWP. The introduction of PHP, and the fact that its included with Server instead of Server Advanced makes it a no brainer if you need to host out to more then five web clients.