Since a wiki page could be very long - contains several different level of sections - it could not be very easy to locate the position I want to edit.
Think about this scenario, when reading a long page, at the bottom part I find a typo, then I have to remember the context, scroll to the top of the page, click `edit` button, and then scroll back to the location of the typo (or search for it). After correcting the typo, save the content, I have to scroll down to where I was reading.
Wikimedia has a [section editing feature](http://meta.wikimedia.org/wiki/Help:Section#Section_editing): //Sections can be separately edited by clicking special edit links labeled "[edit]" by the heading//. Hope you add this feature to Phriction.