POSSIBLE ANOMALY IN SIDE STICK ON TKOF ROTATION. ACFT COMPUTER MONITOR DETECTED 4 UNRELATED SYS FAULTS AT TIME OF ROTATION. ACFT HAD HISTORY OF ELEVATOR AILERON COMPUTER (ELAC) PROBS. BECAUSE OF SHORT DURATION OF PERCEIVED PROB; SUSPECT EXPERIENCE LEVEL OF PF.

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ON DEP FROM MEM RWY 18R; AT ROTATION I EXPERIENCED A VAGUENESS OR VOID SPOT IN THE SIDE STICK CTLR. THIS DIDN'T CAUSE A CTLABILITY PROB; BUT IT DID FEEL ODD. SOMEWHAT LIKE DRIVING AN OLD CAR WITH LOOSE STEERING -- PUTTING IN AN INPUT WITHOUT RESPONSE FROM THE VEHICLE REQUIRING AN ADDITIONAL INPUT; WHICH OF COURSE IS TOO MUCH; AND THEN NEEDING TO CORRECT WITH A SIMILAR RESPONSE IN THE OTHER DIRECTION. THE CONDITIONS WERE A R XWIND (220 DEGS AT 10 KTS ATIS WIND); DRY; DAYLIGHT. AT VR THE ACFT ROTATED NORMALLY AND NOSE AND MAIN GEAR LIFTED AS NORMALLY EXPECTED. SHORTLY AFTER LIFTOFF THE R WING DIPPED. I ADDED L PRESSURE (SIDE STICK WAS SOMEWHAT R OF CTR) WITH NO RESPONSE. FURTHER CORRECTING OF COURSE WAS TOO MUCH AND I HAD TO RECORRECT BACK R. ALL THIS ROLLING CAUSED THE CLB TO FLATTEN OUT; BUT WE FINALLY CLBED OUT OK. SHORTLY AFTER; ATC GAVE 2 R TURNS; DURING BOTH I NOTICED A VAGUENESS WHEN THE SIDE STICK WAS DEFLECTED TO THE R (THE STICK COULD BE MOVED 1/2 THE WIDTH OF THE STICK WITHOUT ACFT RESPONSE -- STICK IS APPROX 2 INCHES THICK). THE CAPT TRIED MANEUVERING THE ACFT AND RPTED HIS SIDE STICK FELT NORMAL. IN TRYING TO DETERMINE WHAT TO DO; WE EXTENDED FLAPS AND AGAIN TRIED BOTH SIDE STICKS; THEN CLEANED UP AGAIN AND RETESTED. BOTH STICKS WERE PERFORMING NORMALLY. WE CONTACTED DISPATCH; MAINT CTL AND TRAINING -- ALL PARTIES AGREED OF OUR PLAN TO CONTINUE TO DEST WITH LNDG TO BE MADE WITH L SIDE STICK. AT DEST WE NOTED THAT THE COMPUTER MONITOR DETECTED 4 UNRELATED SYS FAULTS AT THE TIME OF ROTATION. ALSO; THE ACFT HAD A HISTORY OF REPLACING THE ELEVATOR/AILERON COMPUTER.