Assign the lt and rt keys, use them ingame.
Resulting log:
```
[2016-06-23 15:45:28] java.lang.NullPointerException
[2016-06-23 15:45:28] at org.lwjgl.input.Controllers.isEventButton(Controllers.java:214)
[2016-06-23 15:45:28] at org.schema.schine.input.KeyboardMappings.a(SourceFile:267)
[2016-06-23 15:45:28] at obfuscated.P.k(SourceFile:276)
[2016-06-23 15:45:28] at obfuscated.aEq.a(SourceFile:103)
[2016-06-23 15:45:28] at obfuscated.P.a(SourceFile:167)
[2016-06-23 15:45:28] at obfuscated.MY.a(SourceFile:149)
[2016-06-23 15:45:28] at obfuscated.avr.b(SourceFile:613)
[2016-06-23 15:45:28] at obfuscated.P.e(SourceFile:902)
[2016-06-23 15:45:28] at org.schema.game.common.Starter.startMainMenu(SourceFile:1148)
[2016-06-23 15:45:28] at org.schema.game.common.Starter.main(SourceFile:941)
[2016-06-23 15:45:28] [GLFRAME] THROWN: class java.lang.NullPointerException Now Printing StackTrace
[2016-06-23 15:45:28] java.lang.NullPointerException
[2016-06-23 15:45:28] at org.lwjgl.input.Controllers.isEventButton(Controllers.java:214)
[2016-06-23 15:45:28] at org.schema.schine.input.KeyboardMappings.a(SourceFile:267)
[2016-06-23 15:45:28] at obfuscated.P.k(SourceFile:276)
[2016-06-23 15:45:28] at obfuscated.aEq.a(SourceFile:103)
[2016-06-23 15:45:28] at obfuscated.P.a(SourceFile:167)
[2016-06-23 15:45:28] at obfuscated.MY.a(SourceFile:149)
[2016-06-23 15:45:28] at obfuscated.avr.b(SourceFile:613)
[2016-06-23 15:45:28] at obfuscated.P.e(SourceFile:902)
[2016-06-23 15:45:28] at org.schema.game.common.Starter.startMainMenu(SourceFile:1148)
[2016-06-23 15:45:28] at org.schema.game.common.Starter.main(SourceFile:941)
```