Control your Viewport and Camera's focal length with your mouse.

Precision Mode

Hold the Shift key to rotate your light with finer accuracy (your keymap must not include the SHIFT key for it to work).

Drag direction

Set your mouse drag direction to horizontal or vertical.

Keymaps (can be changed via the add-on settings or in the main keymap menu)

• Focal Length Tweaker: CTRL+ALT+MMB
• Switch from Ortho/Perspective (existing Keymap in Blender, but this one makes more sense from muscle memory point of view): CTRL+ALT+MMB (Double Click)