BEECHCRAFT KING AIR FLT CREW ENCOUNTERS A PROB (NOT STATED) REQUIRING A DIVERSION. CAPT'S DESIRE NOT TO DECLARE AN EMER WHILE ACTING AS IF THERE WAS ONE CAUSES PROBS WITH ATC.

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WE DEPARTED FT WORTH MEACHAM (FTW) HEADING TO MUSTANG BEACH (RAS). WE WERE HANDED OFF FROM ZFW TO WACO APCH LEVELING AT 10000 FT (LAST CLRED ALT). WHILE CHKING IN ON THE NEW FREQ; ONE OF THE PAX YELLED UP FRONT FOR THE CAPT TO COME TO THE BACK OF THE ACFT TO CHK SOMETHING OUT. I TOOK OVER FLYING AS HE WENT TO THE BACK OF THE ACFT. HE CALLED UP TO ME AND SAID THAT WE HAD TO GET DOWN IN A HURRY; AND TOLD ME TO REQUEST A DIVERSION INTO WACO. I CALLED WACO APCH AND NOTIFIED THEM THAT WE NEEDED TO DIVERT INTO WACO INTL (ACT). I WAS CLRED TO THE WACO ARPT AND WAS GIVEN THE CURRENT CONDITIONS AT THE ARPT. I PUT THE DEST IN THE GPS AND STARTED TURNING DIRECT TO THE ARPT. THE CAPT RETURNED TO HIS SEAT AND CHKED THE GPS AND DETERMINED THAT IT WOULD BE FASTER TO RETURN TO FT WORTH. I NOTIFIED WACO APCH THAT WE WANTED TO CHANGE TO FT WORTH MEACHAM; AND WAS TOLD TO STAND BY. THE CAPT PULLED BACK THE THROTTLE ON THE #2 ENG AND STARTED A DSNDING TURN TO THE N. THE CTLR WAS UPSET WITH OUR TURN AND TOLD US TO RETURN TO A HDG OF 180 DEGS; WHICH WE DID. HE THEN CAME BACK WITH AN AMENDED CLRNC DIRECT TO THE FT WORTH ARPT AT 4000 FT; AND HANDED US OFF TO REGIONAL APCH. I WAS STILL TRYING TO FIND OUT WHAT THE ISSUE WAS WITH THE ACFT FROM THE CAPT WHEN HE TURNED THE ACFT BACK TOWARDS FT WORTH. THE CAPT REQUESTED A PRECAUTIONARY LNDG AT FTW WITHOUT ANY EMER VEHICLES. WE WERE IN VMC AT THE TIME; AND NO OTHER ACFT WAS SHOWING ON OUR TCAS THROUGHOUT THE ENTIRE EVENT. WHEN WE ARRIVED AT FT WORTH; WE WERE TOLD TO CONTACT THE SUPVR AT THE WACO TWR. HE WAS EXTREMELY UPSET FOR US TURNING WITHOUT CLRNC AND SAID THAT WE SHOULD HAVE DECLARED AN EMER. HE QUESTIONED THE CAPT AT LENGTH ABOUT HIS FLYING ABILITY AND HISTORY. THE REQUEST TO DIVERT INTO WACO; RECEIVING CLRNC; REQUEST TO DIVERT TO FT WORTH; AND THE TURN TO THE N WAS DONE WITHIN 2 MINS. I THINK THERE WASN'T ENOUGH COM AMONG US IN THE COCKPIT; NOR WAS ATC ADVISED OF THE SERIOUSNESS OF OUR SIT. INSTEAD OF JUST RETURNING TO THE HDG OF 180 DEGS AND AWAITING THE AMENDED CLRNC; I THINK WE SHOULD HAVE DECLARED AN EMER AND INFORMED THEM OF THE NATURE OF OUR SIT. THE CAPT DID NOT WANT TO DECLARE AN EMER DUE TO THE FACT THAT THERE WOULD BE EXTRA PAPERWORK AND HE DIDN'T WANT TO BURDEN THE ATC SYS WHEN HE FELT AS THOUGH WE COULD HANDLE EVERYTHING ON OUR OWN. I NEED TO BE MORE DIRECT IN REQUESTING INFO FROM THE CAPT AND EXPLAIN MORE TO ATC TO PREVENT THIS IN THE FUTURE. I SHOULD HAVE REMINDED THE CAPT THAT EVEN THOUGH WE WERE IN VMC; THAT WE WERE STILL ON AN IFR FLT PLAN AND PREVENTED THE TURN. MY LACK OF UNDERSTANDING THE PROB IN THE BACK OF THE PLANE KEPT ME QUIET; AND I ASSUMED THE CAPT HAD MUCH MORE EXPERIENCE AND BETTER KNEW HOW TO DEAL WITH THE SIT.