Moving back to the front or end of a long URL entery with out having to use delete?
Yes, just checked it on my iPhone, and have been using it on my iPad for awhile.

On an iPhone you have to do a long press(or 3D press) on the keyboard (Trackpad mode, thanks @fsb for its official name), this turns the whole keyboard into a trackpad bound to the text cursor. 
The keyboard will turn grey and the letters will disapear. You can now move your finger and it will move the text cursor.

Demonstration on Youtube.

On the iPad it works with 2 fingers together as well.

The other method is holding your finger down when trying to select a spot in text till a magnifier pops up, but that is not as easy with URLs.