A PVT PLT IN AN SMA PULLS ONTO THE RWY WITH ANOTHER SMA ON APCH. RPTR HAD NOT SEEN THAT ACFT AND HAD DIFFICULTY IN ATTEMPTING A TKOF SINCE ANOTHER SMA WAS STILL ON THE RWY; TAXIING.

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I HAD JUST COMPLETED MY RUN-UP; A LNDG ACFT HAD JUST PASSED THE THRESHOLD FOR A LNDG AND WAS ABOUT TO TOUCH DOWN. THERE WERE NO ACFT IN THE PATTERN OR VISIBLE ON APCH SO I ANNOUNCED ON THE RADIO MY INTENTION TO TAXI INTO POS FOR TKOF AND STARTED TO TAXI. JUST AS I HAD TAXIED ONTO THE RWY AND WAS STARTING TO TURN R TO ALIGN WITH THE RWY I NOTICED AN ACFT TO MY L ON THE INST APCH ON ABOUT A 1 MI FINAL. THE INST APCH TO THIS RWY IS ALIGNED DIAGONALLY TO THE RWY ON THE OPPOSITE SIDE OF RWY CTRLINE TO THE VFR PATTERN. I DIDN'T SEE HIM ON MY INITIAL SCAN MAYBE BECAUSE I DIDN'T EXPECT TO SEE SOMEONE APPEAR FROM THAT DIRECTION OR MAYBE IT WAS THE LOW SUN BEHIND HIM. WELL; I FELT ALL I NEEDED TO DO AT THIS POINT WAS WAIT FOR THE ACFT THAT HAD JUST LANDED TO CLR THE RWY; I WOULD DEPART NORMALLY AND THE ACFT BEHIND COULD LAND NORMALLY. A SHORT TIME AFTER I POSITIONED ON THE RWY THE PLT OF THE APCHING ACFT ANNOUNCED THAT HE WAS ON SHORT FINAL. THE ACFT THAT HAD JUST LANDED TOOK A VERY LONG TIME TO CLR THE RWY. I STARTED TO ROLL SLOWLY TRYING TO SPACE OUT THE ACFT. THE PLT OF THE ACFT THAT HAD JUST LANDED PASSED UP SEVERAL TXWYS THAT COULD HAVE BEEN USED TO VACATE THE RWY. TAXIING SLOWLY HE BACK TAXIED A SHORT DISTANCE TO ONE AND FINALLY CLRED THE RWY. HE PROBABLY PLANNED TO ROLLOUT TO THE END. IN THE MEANTIME THE ACFT ON FINAL HAD TO DO A GAR AND PASSED ON MY R APPROX 100 FT ABOVE AND SEVERAL HUNDRED FEET TO THE R. I THEN CONTINUED WITH A NORMAL DEP. ALL THE PLTS HAD TO ADJUST WHAT THEY HAD PLANNED AND THINGS WORKED OUT BUT I'M SURE IT WAS A HURRIED SIT FOR EVERYONE. MY SUGGESTIONS FOR THE 3 PLTS INVOLVED. BE CONSIDERATE AND DON'T SPEND AN EXCESS AMOUNT OF TIME ON AN ACTIVE RWY AFTER LNDG. SOMETIMES THIS MAY NOT BE DONE DUE TO LACK OF CONVENIENT TURNOFFS; NON FAMILIARITY WITH THE ARPT OR ACFT PERFORMANCE. INSTEAD OF TAXIING INTO POS TO HOLD ON THE RWY WAIT FOR LNDG ACFT TO VACATE THE RWY BEFORE TAXIING INTO POS. SOME ACFT MAY NOT CLR THE RWY AFTER LNDG AS SOON AS MOST. WHEN ON A STRAIGHT-IN INST APCH IN VFR CONDITIONS BREAK OFF THE APCH AND JOIN THE PATTERN AS SOON AS PRACTICAL INSTEAD OF CONTINUING THE APCH TO SHORT FINAL WHEN THERE ARE ACFT ON THE RWY. THIS SIT CREATES UNEASINESS TO THE ACFT OPERATORS ON THE GND AND MAY LEAD TO HASTY OPS.