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: Sections can be separately edited by clicking special edit links labeled "[edit]" by the heading. Hope you add this feature to Phriction.