A DHC8 FO CALLS FOR MISSED APCH DUE TO ENTERING THE CLOUDS ON A VISUAL APCH. THE CAPT TAKES OVER THE ACFT AND LANDS.

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CAPT CALLED ARPT IN SIGHT FROM ABOUT 15 MI E OF THE FIELD. CAPT NEVER ASKED FOR CONCURRENT FOR VISUAL CALL. CAPT ACCEPTED VISUAL APCH CLRNC BASED ON VISUAL CONTACT WITH PRECEDING ACFT. LOST SIGHT OF PRECEDING ACFT AT ABOUT 2000 FT AGL. DID NOT HAVE RWY IN SIGHT AT ANY TIME DURING APCH. NOTING THAT WE WOULD NOT MAINTAIN CLOUD CLRNC IF WE CONTINUED; I INITIATED A GAR BY STATING 'MISSED APCH; CONDITION LEVERS MAX; SET PWR; FLAPS ONE NOTCH UP' AND STARTING ROTATION TO THE COMMAND BARS. I FELT A SOLID PUSH ON THE CTL COLUMN AND THE CAPT ASKED 'WHERE ARE YOU GOING?' I STATED 'AROUND; LET'S GO!' AND REPEATED THE MISSED APCH CALL. THE CAPT RESTR CTL MOVEMENT AGAIN AND RESPONDED 'MY AIRPLANE.' I RELEASED THE CTLS TO THE CAPT AND MADE ADDITIONAL CALLOUTS AS NECESSARY TO MAKE THE REMAINDER OF THE APCH AS SAFE AS POSSIBLE. GPWS CALLED OUT 'SINK RATE' TWICE BELOW 500 FT AGL DUE TO THE CAPT'S MANEUVERING. THE ACFT PASSED THROUGH ONE CLOUD FOR A PERIOD OF 3-5 SECONDS AND PASSED THROUGH THE EDGES OF ANOTHER DURING THE CAPT'S APCH. I BELIEVE THAT THIS SIT WAS CAUSED BY THE CAPT NOT HEEDING MY APCH BRIEFING FOR THE ILS RWY 10R APCH. THIS WOULD HAVE NEVER HAPPENED IF THE CAPT HAD USED GOOD JUDGEMENT WHEN OFFERED THE VISUAL APCH WITHOUT THE ARPT IN SIGHT. I ALSO BELIEVE THAT THE CAPT'S JUDGEMENT ABOUT INTENTIONALLY VIOLATING FAR'S AND COMPANY PROCS IS FAULTY. THIS CAPT IS NOT THE USUAL IN THE COMPANY. WITH ANOTHER CAPT; I AM CERTAIN THAT THE MISSED APCH WOULD HAVE HAPPENED WHEN I CALLED FOR IT; AND WE WOULD HAVE CONDUCTED THE ILS WITHOUT DIFFICULTY. ACTUALLY; WITH OTHER CAPTS; I DO NOT BELIEVE THAT THE SIT OF A VISUAL APCH WITHOUT THE RWY OR ARPT IN SIGHT WOULD HAVE EVER OCCURRED.