Rotate Camera Via MMB?

Could you possibly add an option to hold the middle mouse button to move the camera? right now the middle mouse button places voxels. I know theres a camera i can select to move the camera but it would be far more efficient for my work flow if i could rotate the camera without placing blocks with the middle mouse button.
EDIT: And maybe an option for free camera where i can freely move the camera around to get in those tight places if i need to?
EDIT: And maybe an option for free camera where i can freely move the camera around to get in those tight places if i need to?