Again Seeadler did it
It's only a rough guess right now, but I bet it is very easy to actually make use of the extra space. The menu.ini should be easily coaxable to place items there. So far, when you have a slide out item it is just doing that: Sliding out of the visible area, but not actually dissapearing. This is proof that you can actually put things there, so I bet we can do lots of incredible things with the extra space available. The only problem is writing it in, but that's more time consuming that difficult, once you know how it works.