Find the setting you need...quickly!
There are over 100 options in Visio 2010's Backstage | Options dialog!
It's a heck of a lot easier to search the text on this page then to visually scan the dialog with it's nine different tabs!
Visio 2010 Backstage Options Mega List (http://www.visguy.com/2010/06/28/visio-2010-backstage-options-mega-list/)
Do you know, is there any info on Visio backstage customization available?
I mean, like one requested here: http://visguy.com/vgforum/index.php?topic=1619
I think that the Solution Publishing tool from the SDK is supposed to allow you to add new template groups, but I haven't tried it with 2010, and I think you've already experimented with it.
Chris Hopkins has written a great article: A Complete Solution for Visio 2010 and Visio Services (http://blogs.msdn.com/b/chhopkin/archive/2010/05/28/a-complete-solution-for-visio-2010-and-visio-services.aspx). That might have some more info about publishing.
And of course Introducing the Microsoft Visio 2010 Beta SDK (http://blogs.msdn.com/b/visio/archive/2009/11/19/introducing-the-microsoft-visio-2010-beta-sdk.aspx) is another good place to start as well.