SMA X UNCOORD UNAUTH RWY XING HAD LTSS FROM SMA Y. RWY INCURSION. SYS ERROR.

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WORKING GND CTL. PRIMARY RWY 16L. SMA X WAS TAXIED OUT TO RWY 9. RWY 9 INTERSECTS 16L MIDFIELD. CALLED TO TAXI OUT FOR DEP WITH A VERY BAD RADIO. IT WAS UNCLR AS TO HIS POS ON THE FIELD. I ASKED THE ACFT 3 TIMES IF HE WAS AT THE TERMINAL OR AN FBO. TO TAXI FROM THE TERMINAL THE ACFT WOULD NOT INTERFERE WITH ACFT AT RWY 9; BUT FROM FBO HE WOULD HAVE TO CROSS THE DEP END OF RWY 9 TO TAXI TO 16L. I TRIED TO PIN HIM DOWN TO ONE OR THE OTHER. IT FINALLY SOUNDED LIKE HE WAS AT THE TERMINAL (NO HOLDING INSTRUCTION NEEDED). SO; I SAID; 'WRONG TYPE (I COULDN'T' EVEN UNDERSTAND HIS TYPE ACFT AND HE MADE NO ATTEMPT TO CORRECT ME); UNDERSTAND YOU'RE AT THE TERMINAL; FROM THE TERMINAL; TAXI TO RWY 16L. HIS TERRIBLE RADIO; AND THE FACT THAT WE HAVE A LOCALLY BASED WRONG TYPE WHO HAS A BAD RADIO AND PARKS AT THE TERMINAL RAMP WERE CONTRIBUTING FACTORS. TWR HAD RWY 9 SMA X POS AND HOLD WAITING FOR TFC DEPARTING 16L TO CLR THE CTRLINE. THE TWR CTLR CLRED SMA X FOR TKOF; THE SUPVR IN THE TWR SHOUTED THAT AN SMA WAS XING THE DEP END. I WAS PREOCCUPIED ON GND CTL WORKING 2 OTHER ACFT. SMA X CLRNC WAS CANCELLED UNTIL THE RWY WAS CLR. MY JUDGEMENT THAT I HAD 'COVERED' MYSELF BY SAYING THE 'UNDERSTAND YOU'RE AT THE TERMINAL; FROM THE TERMINAL; TAXI...' WAS POOR. I ALSO SHOULD HAVE TOLD HIM TO HOLD SHORT OF RWY 9 JUST AS INSURANCE. IT ALWAYS SURPRISES ME HOW OFTEN GA PLTS WILL ACKNOWLEDGE INSTRUCTIONS THAT THEY KNOW ARE BASED ON A MISUNDERSTANDING; AND YET WILL NOT ATTEMPT TO CORRECT THE CTLR.