BE58 INSTRUCTOR AND TRAINEE HAD TRACK DEV IN ZFW CLASS A AND OKC CLASS E AIRSPACES.

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THE FLT WAS A TRAINING FLT TO PRACTICE A RAPID LOSS OF CABIN PRESSURE FOLLOWED BY APPROPRIATE ACTION AND AN EMER DSCNT. WE WERE ISSUED; UPON REQUESTING A LOWER ALT; ONLY 15000 FT. I WANTED LOWER; 10000 FT DIRECTLY SO THAT WE COULD TAKE OFF OUR OXYGEN MASKS AND COMPLETE THE TRAINING EXERCISE. IN ORDER TO RECEIVE THIS CLRNC; IT WAS NECESSARY TO SPEAK DIRECTLY TO APCH WHICH CTLED 15000 FT AND BELOW; NOT CTR WHICH CTLED AIRSPACE ABOVE 15000 FT. APCH ISSUED A CLRNC TO 10000 FT AND HDG OF 010 DEGS. I BELIEVED THAT A TIGHT 360 DEG TURN WOULD NOT AFFECT OUR TRACK AND WAS IMPORTANT TO SHOW MY STUDENT IN ORDER TO LOSE ALT QUICKLY IN AN EMER SIT. HOWEVER; AFTER DEPRESSURIZING; THE CHANGE IN PRESSURE MUST HAVE SLOWED MY REACTIONS EVEN WITH OXYGEN ON. THE 360 DEG TURN WAS NOT AS TIGHT AS I EXPECTED AND THE CTR CTLR OBSERVED MY COURSE DEV AND TELEPHONED APCH; WHO I WAS IN CONTACT WITH; TO QUESTION MY ACTIONS. THERE WAS POTENTIAL TFC AT FL180; HOWEVER; NO MINIMUM SEPARATION WAS BROKEN. I HAVE SINCE RECEIVED RECURRENT TRAINING ON PROPER EMER DSCNT PROC TO NOT DEVIATE MORE THAN 10 OR 15 DEGS IN EMER IF POSSIBLE AND TO ADVISE THE CTLR OF MY ACTION.