When you rotate objects by entering a value manually in the AutoX editor, this value can not exceed '179.999...' ("New value is too high" - although it does round to 180°). If you drag the slider, 180° rotation is possible. The same happens in the other direction: value '-180' is too low.

This may not be that much of an issue - or might even be coded to work that way - but I consider it a little bug.