Hi Beth, Joe Davis requested adding an admin CSS class to all admin pages back in October. I see in my own copy (2.3.5.6, built from source) that there is indeed an "admin" class rendering on the div just inside of divCenter.
So, if you have the admin CSS class appearing, you can do this:
.admin {width:1000px !important;}
This will cause the admin portions of the page to "stick out" on the right side, but that's just a cosmetic issue--the important thing is that you will be able to get to everything you need to.
If you don't see the admin class when inspecting the rendered output of your site (try FireBug, if you don't have it), I'm sure it will be available to you in the next release of mojoPortal.
I'd be interested to hear feedback on how this works for you, and if you run into any trouble using it.
Jamie