BE55 PLT; FLYING FROM THE R SEAT HAD A RWY INCURSION AT BAF.

Narrative

WE WERE PREPARING TO DEPART TO DO 3 TKOFS AND 3 LNDGS IN THE PATTERN AT BAF. I WAS PLANNING TO FLY THE ACFT; SINCE THE THROW-OVER YOKE WAS ON MY (R SEAT) SIDE. THERE ARE NO BRAKES ON MY R SIDE OF THE ACFT. THE OWNER OF THE ACFT; AFTER I YELLED TWICE TO 'STOP!' STOPPED THE ACFT ON THE HOLD LINE MARKINGS. THE CTLR SHOUTED FOR US TO 'STOP NOW!' AFTER CATCHING MY BREATH; I SAID THAT 'WE WERE STOPPED.' I ASKED THE OWNER WHY HE DID NOT STOP. HE SAID THAT HE'D THOUGHT WE WERE CLRED FOR TKOF. I WAS WELL AWARE THAT I HAD ONLY BEEN CLRED TO TAXI AND HAD THERE BEEN BRAKES ON MY SIDE (R SIDE) OF THE ACFT; THIS INCIDENT WOULD NOT HAVE HAPPENED AT ALL. I BELIEVE THAT ALL GA ACFT SHOULD HAVE BRAKES ON BOTH SIDES OF THE ACFT. I AM GLAD THAT THERE WAS NO OTHER ACFT IN THE PATTERN; AND THAT WE DID NOT ADVANCE INTO THE WHITE RWY BOUNDARY AREA. (THE MAIN GEAR WAS ON THE HOLD LINES AND THE NOSE GEAR WAS NO MORE THAN ABOUT 2 FT PAST THE LAST MARKINGS.) IN THE FUTURE WHEN I FLY ON THE R SIDE OF AN ACFT WITH NO BRAKES ON THAT SIDE I WILL BRIEF THE PERSON ON THE L SIDE THAT WE WILL STOP WELL BEFORE THE HOLD SHORT LINE! I DON'T EVEN WANT TO COME CLOSE TO THIS TYPE OF SIT AGAIN.