The current Fly Navigation (shift+f) is not working so good. It works like a joystick with its acceleration on all the navigation keys.

This is not an effective way to look around in a scene.
The normal pan, rotate and zoom navigation works very good when working with a single and/or smaller object. But if you are working with a big scene like a city. Then you want to be able to fly through it fast and easy to see how everything looks.
Or if you work with the interior of something, you might not want to rotate around the "room" but let the "camera" turn around its own pivot to be able to see all the inside.

I have searched and asked around, and many modelers like to be able to move around like this.