As of right now - In the property panel, text boxes with numerical values can be clicked and dragged up and down with the mouse to quickly change the value without typing.

Just like Photoshop - If I could hold down SHIFT to increase the speed of the value changing, or ALT to slow it down (for better precision) this would benefit the feature.
For an object's rotation value, SHIFT could snap to certain angle increments. It's extremely common to rotate something by 45° or 90°.