The latest update of iSnipe has brought back the old functionality. The one of the previous updates introduced a new user interface that made iSnipe difficult to use quickly and therefore made it useless in the field. It also introduced a few bugs which stopped some of the features such as the shot incline working properly.
This new update has brought back the option of having the old user interface which is much easier and quicker to use. It has also fixed (as far as I can tell so far) all the bugs.