TWR MISJUDGES TFC SPACING WHEN USING OPPOSING RWYS FOR LNDG AND DEP.

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TKOF. BTWN XA30 AND XB00 SATURDAY MORNING. WIND 220 DEGS AT 7 KTS. ACTIVE RWY INDICATED AS RWY 27. GND AND TWR ARE ON THE SAME CHANNEL. ACFT X CALLS FOR CLRNC TO TAXI. CLRNC RECEIVED TO RWY 27. ACFT X HEARS A PLANE CALL IN FROM 10 MI W AND REQUEST A LNDG ON RWY 9. HE IS TOLD BY CTLR THAT RWY 9 IS ACCEPTABLE AND HE IS DIRECTED TO CALL IN AT 5 MI. ACFT X PERFORMS RUN-UP AT THE END OF RWY 27. PLT TO THE W CALLS IN AT 5 MI AND IS TOLD BY THE CTLR TO CALL IN AT 3 MI. A LOT OF TALK FROM VARIOUS PLTS ON THE RADIO (ABOUT 1 MIN). ACFT X IS READY TO GO AND WAITING A CHANCE TO CALL IN. PLT TO THE W CALLS IN AT 3 MI AND IS CLRED TO LAND ON RWY 9. ACFT X CALLS IN AND IS CLRED TO TKOF ON RWY 27. ACFT X TAXIES INTO PLACE WITH NO DELAY AND BEGINS TKOF ROLL. DURING TKOF ROLL CTLR CALLS ACFT X. MESSAGE IS DIFFICULT TO HEAR DUE TO TKOF NOISE. ACFT X LIFTS OFF AND ASKS FOR A REPEAT OF THE MESSAGE. CTLR REPEATS MESSAGE: TURN R AT EARLIEST OPPORTUNITY. ACFT X RESPONSE 'X.' CTLR CALLS AGAIN WITH A LOT OF IRRITATION FOR ACFT X TO TURN R. ACFT X RESPONDS THAT ACFT WILL TURN R AS SOON AS POSSIBLE. MEANWHILE THE ONCOMING ACFT IS CLRLY VISIBLE; LESS THAN 1/2 MI ON FINAL. ACFT X FLIES TO 200 FT ABOVE GND LEVEL; TURNS R; AND DEPARTS TO NE. POOR JUDGEMENT ON THE PART OF THE CTLR RESULTED IN A LESS THAN SAFE DEP AND LNDG FOR THESE 2 ACFT. ADDITIONALLY; THE ANXIETY AND IRRITATION ON THE PART OF THE CTLR INCREASED THE LIKELIHOOD THAT ACFT X WOULD TURN TOO EARLY OR STALL WHILE CLRING THE AIRSPACE. ACFT X HAD FEW OPTIONS IF THERE HAD BEEN A MECHANICAL PROB ON THE TKOF ROLL. THE SIT COULD EASILY HAVE RESULTED IN ONE OR BOTH PLTS MAKING AN ERROR IN FLT OR JUDGEMENT.