SMA LANDED ON RWY 22 AND TURNED OFF ON RWY 10/28 WITHOUT CLRNC. RWY 28 ACTIVE ALSO.

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ACFT LANDED RWY 22. LNDG DISTANCE BROUGHT ACFT TO TAXI SPD AT INTXN OF RWY 28. INSTEAD OF CONTINUING TO THE FIRST TXWY; ACFT MADE A LEFT TURN ONTO RWY 28--ONTO THE ACTIVE RWY AND AGAINST THE FLOW OF TFC. NO ACFT WERE INVOLVED. 7110.65 DOES NOT STATE THAT PLT CANNOT DO THIS. THIS HAS HAPPENED NUMEROUS TIMES. HOW CAN YOU ANTICIPATE SEP WITH SIMULTANEOUS ARRS IF THE PLT NOT HOLDING SHORT CAN TURN ONTO AND INTO TFC LNDG OTHER RWY? DO YOU HAVE TO STATE IN HIS LNDG CLRNC 'DO NOT TURN OFF ON RWY 28'? CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: CALLBACK MADE TO RPTR TO CONFIRM THAT THIS PROB IS SAME THAT HAS BEEN GOING ON FOR APPROX 1 YR. THE FIRST AVAILABLE TXWY IS ABOUT 3500-4000' DOWN THE RWY; AND PLTS; BOTH GA AND ACR; SEEM TO FEEL THAT IT IS LEGAL TO TURN ONTO THE CROSS RWY W/O PERMISSION FROM THE TWR. UNFORTUNATELY; THE FAC MGR ALSO FEELS THAT THIS IS LEGAL AND WILL NOT DO ANYTHING TO CORRECT THE PROB. IT WAS SUGGESTED THAT A UCR MIGHT BE TRIED; BUT NOT SURE THIS IS WITHIN THE PURVIEW OF THAT FORM. RPTR IS UNION REP AND THEY ARE PREPARING A SAFETY COMPLAINT TO BE FORWARDED TO HIGHER AUTHORITY.