If you have shot with a film camera with manual film wind on with good ergonomics you will know that the film handle really makes it easier and more secure to hold the camera. For a number of years now the Thumbs Up company has been producing a range of add-ons to simulate the handling and improve your grip.
The new titanium model for the Leica M is certainly a piece of work and should I buy a Leica M it would be high on the list together with a wrist strap.