We have tested the AirTurn BT 105 with iOS 7.0.4 and Scorecerer 7.08 on an iPad Mini with expected results.
If your AirTurn is not working, first make sure that it is connected to your iPad properly with BlueTooth.
A good way to test that the AirTurn is connected and configured properly is to open the iPad Notes app and fill it with some text on multiple lines. Then connect the AirTurn and as you press the pedals, the cursor in Notes should move (either up/down or left/right, depending on how your AirTurn is configured).
Once that works, then Scorecerer should work too (as long as BlueTooth is enabled in Scorecerer preferences).
If the cursor does not move in Notes, then you have a configuration problem with your AirTurn that has nothing to do with Scorecerer.