B767 FLC CHALLENGE LAX LC WHEN CLRED FOR TKOF WITH OBSERVED MD11 STOPPED ON TXWY TANGO; SHORT OF TXWY B.

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TWR CLRED US POSITION AND HOLD RWY 25R; TFC XING DOWNFIELD. CTLR (TWR) THEN CLRED US FOR TKOF WITH AN ACR Y MD11 ABSOLUTELY 100 PERCENT IN THE RWY ENVIRONMENT (CO-PLT AGREES) BECAUSE THE MD11 HAD STOPPED SHORT OF TXWY B ON TXWY T; I BELIEVE AND A FEW FT OF HIS TAIL WAS STILL ON THE ACTUAL RWY. I SAID NEGATIVE; THE DC-10 (MY INITIAL MISTAKE OF THE MD11) IS STILL ON THE RWY; AND HE WAS STILL STOPPED SHORT OF B. CTLR SAID; NO; HE IS CLR OF THE RWY; TKOF AT YOUR DISCRETION. I WAITED ABOUT 20-30 SECONDS TILL HE MOVED AND TAIL PAST THE DOUBLE SOLID DOUBLE SEGMENTED HOLD LINES ON THE EDGE OF B. SOMEONE NEEDS TO TELL THE ACR Y PLTS ABOUT THE NEED TO CLR A RWY UNLESS THEY WERE GIVEN CLRNC TO STOP THERE SPECIFICALLY. OUR COMPANY PAGE HAS A NOTE THAT WE ARE SUPPOSED TO TURN ONTO TXWY B WHEN XING RWY 25R IN ORDER TO BE CLR OF THE RWY. SOMEONE MUST TELL THE TWR CTLR HOW TO TELL IF AN ACFT IS CLR OF THE ACTUAL RWY WHEN I AND FO ARE 100 PERCENT POSITIVE THAT THE ENTIRE MD11 WAS IN FACT IN THE RWY ENVIRONMENT. IF THE VISIBILITY IS LOW SOMEDAY AND CTLR DOES THAT AGAIN; THERE IS A VERY HIGH CHANCE OF AN INCIDENT. I CONTACTED OUR DISPATCH AFTER TKOF. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR PROVIDED NO ADDITIONAL FACTS EXCEPT TO EXPRESS HIS CONCERN ABOUT ATC NOT PROVIDING A CLR RWY ENVIRONMENT FOR TKOF.