CPR PLT CONCERNED OVER FAC STAFFING POLICY AT DET. APPEARED THAT ATC TWR LCL GND CTLR WORKING A COMBINED POS WAS OVERLOADED; SETTING UP THE POTENTIAL FOR AIR AND GND CONFLICTS.

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APCHING DET VFR ON A SUNNY AFTERNOON I WAS TOLD TO FOLLOW VFR TFC AHEAD WHICH I HAD IN SIGHT FOR RWY 15 -- 'ADDITIONAL TFC L DOWNWIND. R DOWNWIND; 1 MI FINAL; DEPARTING;' ETC. THE TWR CTLR WAS VERY BUSY; AND; AS I SOON FOUND OUT; HANDLING BOTH TWR AND GND FREQS. I DID A SHORT FIELD LNDG AND THEN EXITED AT THE NEXT HIGH SPD. AS I DID SO; I SAW OPPOSITE DIRECTION TAXI TFC ABOUT 200 METERS DOWN THE TAXIWAY AND APPLIED MODERATE BRAKING (RWY-TAXIWAY SPACING IS FAIRLY TIGHT AT DET). AT THAT TIME; I WAS TOLD 'HOLD POS' AND BRAKED HEAVILY TO AVOID ANY TAXIWAY INCURSION. TAXIING TFC THEREAFTER PASSED R TO L AND WE CARRIED ON TO THE RAMP. OBSERVATIONS: IN AN ATTEMPT TO ASSIST THE CTLR WITH THE LARGE NUMBER OF OPS HE WAS HANDLING -- I GOT 'HURRY-UP' MINDED (SHORT FIELD LNDG AND QUICK TURN OFF). I SHOULD HAVE TOLD THE CTLR THAT I WAS UNABLE TO EXIT AND CONTINUED TO THE NEXT INTXN WHERE I COULD HAVE MADE A MORE NORMAL EXIT OFF THE RWY. THIS CTLR HAD TOO MANY RESPONSIBILITIES -- THERE SHOULD HAVE BEEN SEPARATE TWR AND GND CTLRS -- AND RWY EXIT INSTRUCTIONS SHOULD HAVE INCLUDED 'HOLD SHORT OF TAXIWAY ALPHA FOR OPPOSITE DIRECTION TFC;' 'CONTACT GND;' OR 'STAY WITH ME;' ETC. THE CTLR WAS DOING A DECENT JOB -- HE JUST DID NOT HAVE THE TIME TO GIVE EACH ACFT THE REQUIRED ATTN. THE INSTRUCTORS CREATING SOME OF THE CONGESTION MIGHT HAVE PRACTICED AT SOME NEARBY; LOWER USAGE ARPTS. (I'M AN ACTIVE INSTRUCTOR). EVERYONE WAS 'CLRED FOR IMMEDIATE TKOF;' '360 DOWNWIND;' 'GAR;' EXTEND DOWNWIND;' S-TURNING FINAL; ETC.