I agree that having the rotation handle conform to whole numbers (1,2,3 etc (not 1.0923)) would be useful, and I suppose using shift for quickly setting either 15� o 45� angles would be nice.
Still, manually inputting the angles is hardly inconvenient.
**Keep in mind, Sallami12, that you can also doubleclick your sprite, and click one of the "rotate 90�" buttons found there, for easy 90� rotations. If you hold shift while clicking this button, you can rotate all of the animations for that sprite by the same degree.