FAILURE OF CRM COMPOUNDS FLT CREW ISSUES RESULTING FROM INFLT THRUST REVERSER UNLOCKED EICAS MESSAGES.

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DURING AN INITIAL DSCNT; APPROX FL260; WE RECEIVED AN EICAS MESSAGE 'R REVERSER UNLOCKED.' THE CAPT (PNF) SIMPLY HIT THE REVERSER LEVERS DOWN AND THE MESSAGE WENT AWAY. DURING THE NEXT DSCNT AT APPROX FL240; THE MESSAGE CAME ON AGAIN AND EVEN WITH THE CAPT'S ATTEMPTS; THE MESSAGE WOULD NOT GO OUT. WE WERE AT IDLE FOR THE DSCNT AND I DID NOT NOTICE ANY BUFFETING. I STATED; 'I HAVE THE ACFT AND RADIOS; RUN THE MEMORY ITEMS.' THE RESPONSE WAS; 'IT IS AMBER; NOT RED; AND IT IS JUST A SWITCH SET TOO SENSITIVE.' UNDERSTANDING THE CONFUSION OF AN AMBER CAUTION INSTEAD OF A RED EMER EICAS MESSAGE -- AND THE ACFT AT IDLE; IN DSCNT; WITH AMPLE AIRSPD AND NOT BUFFETING -- I FIGURED THE MEMORY ITEMS WOULD BE COMPLETED WHEN THE CAPT GRABBED THE QRH. THEY WERE NOT. THE CAPT AVOIDED ALL CRM. I POINTED OUT THE DOUBLE-BOXED ITEMS WITH THE CAPT'S RESPONSE BEING THAT THE MESSAGE IS AMBER AND THE ACR NEEDS TO GET THEIR ACT TOGETHER. AFTER A SECOND TIME OF NOTING THE DOUBLE BOXED ITEMS; I PERFORMED THE MEMORY ITEMS MYSELF. THE CAPT READ (TO HIMSELF -- I WAS LEFT OUT OF THE LOOP) THE 'YES AND NO' FOR FLT IMPROVEMENT RESPONSE QUESTIONS; BUT DUE TO THE FACT THAT I WAS LEFT OUT; I DID NOT UNDERSTAND AND I HAD TO ONCE AGAIN DIRECT MY ATTN AND QUERY THE CAPT TO GET THE CORRECT EXPLANATION. AFTER LEVELING OFF; WE HAD FULL THRUST LEVER USE. WE LANDED WITHOUT INCIDENT; ONLY WITHOUT THE USE OF THE R THRUST REVERSER. CRM FROM THE CAPT WAS COMPLETELY NON-EXISTENT. THE CAPT THOUGHT THAT HE KNEW THE SYS -- TO THE EXTENT THAT THE DOUBLE-BOXED MEMORY ITEMS WERE BEING IGNORED -- GIVING ME CONCERN; IN THE SAFE OP OF AN ACFT; THAT THE CAPT WILL RELY ON AND OVERRIDE A YOUNGER; NEWER; LESS ASSERTIVE FO.