ACR Y APCH TO OCCUPIED RWY ISSUED GAR SMT X IN POS AND HOLDING.

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SMT X FINISHED MY PRE-TKOF CHK IN RWY 13R RUNUP AREA AT AUSTIN-MUELLER. I THEN CALLED TWR AND TOLD THEM I WAS READY TO GO. TWR REPLIED HOLD SHORT; LNDG TFC. THIS TFC WAS LNDG ON RWY 13L. AFTER TWR TOLD ME TO HOLD SHORT; AN ACR Y CHKED IN ON A 5 MI FINAL FOR RWY 13R. IMMEDIATELY AFTER ACR Y CHKED IN; TWR SAID SMT X TAXI INTO POS AND HOLD. THE OTHER TFC HAD LANDED. THROUGHOUT MY TAXI TO THE RWY AND RUNUP; THE TWR WAS ATTEMPTING TO STEER PLANES ON THE GND BECAUSE GND CTL WAS NOT ON. AFTER MY POS AND HOLD CLRNC THE TWR CONTINUED AIDING TAXIING ACFT. A MIN OR SO LATER; I HEARD FROM TWR 'ACR Y; GAR.' ACR Y REPLIED; 'ROGER; ACFT IN SIGHT' AND FLEW RIGHT OVER ME ON THE RWY TO GAR. I WAS THEN CLRED TO GO AND DEPARTED. ACR Y PROBABLY OVERFLEW ME BY 150 TO 200 FT. THIS PROBLEM AROSE BECAUSE THE TWR CTLR WAS PERFORMING 2 DUTIES AT ONCE. I FEEL GND CTL WAS NEEDED; ESPECIALLY DUE TO THE CONSTRUCTION ON THE TAXIWAYS AND RWYS. THE CTLR WAS TOO BUSY. ALSO; IN LOOKING BACK; I FEEL THAT I SHOULD HAVE ASKED THE TWR CTLR IF I COULD BE CLRED TO DEPART. THERE WAS NOT ANY OTHER DEPARTING ACFT IN MY WAY; AND I KNEW ACR Y MUST BE GETTING CLOSE. I FEEL TO CORRECT THIS; ACFT SHOULD BE KEPT OFF THE RWY UNTIL THEY ARE CLRED FOR TKOF. NOT MUCH TIME IS SAVED IN HAVING A PLANE DEPART FROM IN POS RATHER THEN BEHIND THE TAXI LINE. IF THEY NEED TO GET A PLANE OUT QUICKLY IN A SMALL WINDOW OF TIME; I THINK 'CLRED FOR IMMEDIATE' IS AS EFFECTIVE; AND MUCH SAFER.