A killer add-in to Zope would be a cascade pull-down navigator like the one at MSNBC News. I think it's possible with javascript but I haven't found one that cascades more than one level of content. (I've counted at least three at MSNBC News Menu)

http://www.webreference.com/dhtml/hiermenus/ gives you as many levels as you like, but: it's license is problematic (free for non-commercial use...) also this http://www.dhtmlshock.com/site-navigation/MenuBuilder/default.asp seems to be free.

With a tool like this and Zope internal logic, you would be able to save tons of clicks. If you're in a hurry (sometimes to save a couple of clicks in a object-crowded environment can become one, I know that) you may modify the OFS/dtml/main.dtml file to perform the function you're looking for.

cheers, oliver