A340-600 has a pitch limit indicator as an aid to prevent tail strike.
It is a large orange "V" on the PFD. If you rotate past the apex of the V you will strike the tail. It disappears 3s after take-off.
It cannot prevent you over rotating but it does give you a visual warning as you near the limit.
In my experience most tail strikes have been caused by rotating at to low a speed rather than rotating too rapidly. Similarly on landing holding the acft off to achieve a smoother touchdown has resulted in more tail strikes than simply over flaring. (only an opinion)