Re: possible to edit left column folders, add or delete some?
I have found that the tiki menu can be rather imposing so I simply created a new "module" (admin/modules), added simple HTML -calling them whatever I want- or even wiki links and then assigning the new module to load above the regular wiki menu.
One cool, and only tangentially related thing, is that you can create a module with an RSS feed from wherever -including from within Tikiwiki! I just find this cool and wanted to mention it. Take a look at www.myaurora.org. Many of the side menus and modules I created for specific purposes.
Tiki is very flexible in this way -in fact it's flexible all over!