F100 PIC INADVERTENTLY SHUTS DOWN R ENG WITH FUEL START LEVER. FO; PF; HAD ASKED FOR 'FLAPS 42 DEGS' DURING A TURN ONTO A SHORT VISUAL APCH. CAPT SELECTED THE FUEL START LEVER TO THE 'SHUTOFF' POS INSTEAD AND THE ENG WOUND DOWN. ENG WAS IN A RESTARTED CONFIGN BY TOUCHDOWN. FO NOTED THAT PIC WAS UNDER EMOTIONAL STRESS.

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WHILE ENRTE TO MSP THE CAPT DISCUSSED THE MANY PERSONAL PROBS HE WAS HAVING. HIS PERFORMANCE IN THE COCKPIT APPEARED TO BE NORMAL DESPITE HIS MANY DISTRS. WHILE CONDUCTING A VISUAL APCH; I WAS FLYING THE AIRPLANE. AT 1000 FT AGL I CALLED FOR FLAPS 42 DEGS. THE FLAP INDICATION DID NOT CHANGE SO I REPEATED 'FLAPS 42 DEGS.' THE CAPT RESPONDED WITH 'OH; SORRY' AND SELECTED 42 DEGS OF FLAPS. I NOTICED THAT MY EFIS DISPLAY BLINKED AND BEGAN TO INVESTIGATE. AT THIS TIME I NOTICED THAT THE R ENG HAD BEEN SHUT DOWN. THE CAPT HAD SHUT THE R FUEL LEVER INSTEAD OF MOVING THE FLAP HANDLE. I BROUGHT THIS TO HIS ATTN; WHEREUPON THE CAPT BEGAN TRYING TO RESTART THE ENG. I REALIZED AT THIS TIME I WAS IN A SINGLE PLT SIT. I INCREASED THRUST TO THE L ENG. THE AIRSPD IMMEDIATELY INCREASED TO REF PLUS 20 KTS; SO I KNEW THAT I COULD LEAVE THE FLAPS AT 42 DEGS. I BLED THE EXCESS SPD OFF; MADE SURE ALL LNDG CHKLIST ITEMS HAD BEEN COMPLETED; AND EXECUTED A NORMAL LNDG. THE CAPT HAD THE ENG RUNNING BY TOUCHDOWN; BOTH THRUST REVERSERS WERE DEPLOYED; FOLLOWED BY A NORMAL ROLLOUT. THE CAPT WAS VISIBLY UPSET THAT HE HAD DONE THIS; BUT WAS ABLE TO TAXI TO THE GATE WITHOUT INCIDENT. I BELIEVE THE CAUSE OF THIS INCIDENT WAS THE CAPT'S PREOCCUPATION WITH HIS PERSONAL PROBS AND A CONTRIBUTING FACTOR IS THE CLOSE PROX OF THE FUEL SHUTOFF LEVER TO THE FLAP LEVER WHILE AT THE 25 DEGS FLAPS SETTING. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE CAPT PROBABLY WAS HIGHLY DISTR WITH HIS PROBS. ALTHOUGH HE HAD 'NOT RAMBLED ON' BELOW 10000 FT; HE HAD MADE A SHORT REF TO HIS AFOREMENTIONED PROBS; SO HIS THINKING WAS NOT ALL THAT CLR. THE CHIEF PLT DID NOT THINK THAT THIS WAS A DESIGN PROB. THE FO BELIEVES IT WAS STRICTLY A PLT PROB. THE FO ALSO FILLED OUT AN 'INTERNAL AIR SAFETY RPT' FOR THE COMPANY TO REVIEW.