Tony,

It might be easier to hit this from another angle and create a new skin with the ContentPane in a position that suits your layout. DNN has always used the ContentPane as the default position of modules and for the placement of admin/host/edit modules so moving these on a page by page level, even if it is possible, would be quite a lot of work. Skin designers (including myself) used to create portal and admin skins, where the admin skins generally had a ContentPane centered within the design that would expand to fit admin content (achieved with a table layout). Because div based layouts don't work exactly the same, this seems to have been replaced with one 100% wide div which doesn't always suit the layout of websites.

As Mitchel Sellers has pointed out; there are some pages you can customise, but not all, so maybe a customised Admin skin would be the best route.

Hope this helps,

Rick.