I don't think there's an automatic way to do this. You can
set the height of the div using CSS, (<div
style="height:400px">) but there is a max height of the dialog.
I assume you're hitting this limit if you're asking about
scrolling. I couldn't think of a way to get the dialog to have
native OS scroll bars.
However, I think you can set up your own type of scrolling
with a bit of work and JavaScript. The basic idea is to add your
own buttons for scrolling and in the onclick event for the button
use JavaScript to set display = 'none' or clear the display
property of a node, depending on if you want to show or hide it.
You'll have to work on how you layout your controls since you can
set display to none on tr tags, which is how most of the tag
dialogs are laid out.
Hope that helps,
Chris
Adobe Dreamweaver Engineering