It is a bit different from the navigation features that are on top, because it actually changes the layout of the site.
There is already pagination customization feature in the use profile. I think that is perhaps a better place for it.
Having a shortcut like that on the home page seem pretty nifty, but right now it is very hard to discover. If we group a few features in the widget on the bottom right and made it a bit more discoverable, that could also work well.
But I would recommend against putting anything like that in the nav bar on top.
hmmmm I guess what you're looking for is something like how Facebook works, you can drag and crop your avatar after uploading? That's something we'd love to have in the future, in the meantime just hang tight (and make use of your MS Paint 😉 ) 😛