PLT OF CORP PA31-350 HAS ACFT VEER L AFTER LNDG AND STOP WITH NOSE WHEEL COLLAPSED AND BOTH PROP TIPS BENT.

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UPON LNDG THE ACFT IMMEDIATELY DIVERTED TO THE L; EXITED THE RWY; CAME TO A STOP WITH THE NOSE WHEEL COLLAPSED AND BOTH PROPS IN THE DIRT -- BLADE TIPS BENT. AS IT TURNS OUT; IT WAS MY FAULT. THIS FLT ORIGINATED IN HILTON HEAD AT FBO X. THEY HAD (WITH MY PERMISSION) REMOVED THE BOLT THAT COUPLES MY PEDALS TO THE NOSEWHEEL. MY ACFT DID NOT HAVE THE STC WHICH REPLACES THE BOLT WITH A PIN (A QUICK RELEASE SYSTEM) SO THEIR DOING THIS WOULD HAVE REQUIRED A LOGBOOK ENTRY FOR BOTH THE REMOVAL AND REPLACEMENT OF THE BOLT. THEY DIDN'T KNOW THIS AND NEITHER DID I AT THE TIME. NOR DID THEY PUT A 'BIG RED' FLAG ON THE DISCONNECTED PART WHILE IT WAS DISCONNECTED. I DIDN'T CATCH THIS ON MY PREFLT. WHEN I LANDED AT ROA THE NOSEWHEEL COCKED AROUND SUCH AS TO PULL THE ACFT TO THE L. R PEDAL AND BRAKE COULD NOT OVERCOME THE DIVERGENT PATH. I DIDN'T TRY ASYMMETRIC THRUST TO TRY TO KEEP IT ON THE RWY -- NO PWR SEEMED WISER. TOUCHDOWN TO STUCK IN THE DIRT ONLY TOOK LESS THAN 5 SECS. I'VE GOT NEARLY 800 HRS IN THIS AIRPLANE AND HAVE BEEN ONLY MANY; MANY RAMPS (FBO'S) AND FBO X IS THE ONLY FBO TO DESIRE TO DISCONNECT MY STEERING IN ORDER TO BETTER GROUND HANDLE MY ACFT. IT'S MY FAULT AND I TAKE FULL RESPONSIBILITY. HOWEVER THE EXTENUATING CIRCUMSTANCES ARE INTERESTING.