“…tell us why you want to do that?...”
Sure, Timo. Here is the total ugly truth. 
I am building a site with multiple groups in one organization. For each group the top level menu is the same with one exception. They each have their own home page which “replaces” the “public” home page when they log in. That works because only unauthenticated folks have permissions to see the “public” home page. There is only one administrator. I thought separate child portals would be overkill. For one thing the administrator would have to log in to each portal separately, correct?
Anyway I used the Data Springs Dynamic Login module redirection feature to handle showing different home pages and regular role permissions to show different sub pages under the top level menu items. I also used the menu upgrade I got from Mark Allan’s DNN Garden site for the SolPart Menu. It all works very well for each group. However, it gets a little busy for the administrator especially with the home pages since this is a horizontal menu. There are only 2 groups now but there could be more than 20 soon.
Since there is one “public” home page I thought I might be able to make that “Home” menu item subsume all the other group home pages as child pages programmatically when the administrator logs in. They each have a slightly different name (Home for “Group Name”, etc.). I didn’t think it would be possible to have a separate menu display on all pages for just the administrator like say a vertical one. I guess the other alternative would be to try a vertical menu for all users or one of Mark Allen’s more complex templates. One problem I would have with a vertical menu is that the home page is basically one big Flash module. The design of the Flash module wouldn’t accommodate the vertical menu well. I guess I could try changing that.
In the past I have looked at doing DNN menus in Flash but communication between Adobe Flash and DNN is kludgy. At one point I even had the grandiose idea of having a complete Adobe Flash front end with a DNN back end, i.e. everything you viewed would be Flash but the plumbing would be DNN. I have experimented with it using JavaScript. You have to worry about stuff like encryption of passwords, etc. I have decided to learn Silverlight and MS Expression as an alternative to Flash where tighter integration is needed.
Anyway if anyone can suggest a better approach to this menu problem I would be glad to hear it.