Hi. Yes you can use the mouse and keyboard if you're just looking to help with depth-of-field photography issues.
After a lot of searching I found this in Firestorm:
1) Go to cameratools -->> 3D Mouse tab -->> Enable 3D mouse (Doesn't require a 3D mouse !)
2) Advanced menu -->> Shortcuts -->> Enable Flycam
3) Shift+Alt+F to use
Happy shooting !