Blender 5.0+ plugin designed to bring camera controls similar to UnrealEd 2.0 to Blender. This extension is currently in alpha, so expect limitations and bugs. Please report any as you find them.
As of now, UnrNav is its own tool to prevent clashing with other tools that require click & drag. After installing and enabling, select it from the toolbar or press D to enable it. It works in both Object and Edit mode. If needed, sensitivity can be adjusted from Preferences > Add-ons > UNR Nav.