Out of the box no, but you could probably modify the javascript source to at least provide scrollbar. If you use FireBug, you will see that the Edit Dialog Window is essentially a div with id “editmodeeditgrid” and has overflow:hidden. Overflow:hidden essentially hide the scrollbar, so just modifying this in javascript sources will address this.

<div class="ui-widget ui-widget-content ui-corner-all ui-jqdialog jqmID1" id="editmodeditgrid" style="overflow: hidden

Of course, you could probably create another layout (2, 3 columns, etc) but it will require more tweaking.

Hope this helps.