I regularly find myself whizzing back up to the top of the thread because I caught the top of the iPhone while scrolling down. Its a right bugger when there are hundreds of posts, trying to whizz back down to where I thought I had got to.
I would like, pretty please, to just tap "Find Bookmark" and it takes me back to the last place I saved.
Reloading the page should accomplish that. You can reload by tapping the circular arrow in the location bar at the very top (you may need to scroll up beyond the top of the page to bring it into view).