CAPT OF A LEARJET LR60 BELIEVES THAT THE TWR CTLR CLRED A SEL SMA FOR TKOF BEFORE THEY WERE CLR OF THE RWY AFTER LNDG.

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ON LNDG; MY SIC/PF WAS HAVING A CHALLENGE WITH THE LNDG AND ROLLOUT. AS MY FLT WAS TURNING TO CLR THE RWY; TWR CLRED AN ACFT TO TAKE OFF BEHIND US. AT THIS TIME THE SIC/PF STARTED HAVING TROUBLE WITH THE NOSEWHEEL STEERING AND THRUST REVERSERS AND STOPPED CLRING THE RWY. I CALLED FOR HIM TO 'CLR THE RWY NOW!' WHILE REACHING FOR THE 'EMER STOW' AND CTLS. TWR ALSO CALLED FOR US TO EXPEDITE CLR OF THE RWY. I'M NOT SURE IF THERE WAS AN ACTUAL INCURSION; BUT IT WAS TOO CLOSE FOR MY COMFORT. CONTRIBUTING FACTORS: 1) IMPROPER THRUST REVERSER AND NOSEWHEEL STEERING MANIPULATION; AND ENERGY MGMNT BY A VERY INEXPERIENCED; ALTHOUGH TYPE-RATED PLT. THERE WAS ENOUGH MOMENTUM FOR MY FLT TO CLR THE RWY SAFELY. 2) A TFC SIT AT BED THAT MIXES TOO MANY AND TOO MANY TYPES; ESPECIALLY ON VFR DAYS. A MIDAIR OR AN INCURSION IS INEVITABLE AT THIS ARPT (IE; 2 DAYS PRIOR TO THIS FLT I WITNESSED A HEAD-ON NMAC ON DOWNWIND BY 2 ACFT). THE ARPT TFC EXCEEDS ITS CAPACITY ON VFR DAYS. THIS RESULTS IN SITS WHERE ACFT ARE 'PUSHED;' IE; CLRING AN ACFT FOR TKOF BEFORE THE RWY IS CLR. 3) EXPECTANCY -- WE MUST ALWAYS BE READY FOR THE UNEXPECTED; WHETHER IT BE TFC NOT CLRING DOWNFIELD OR ANOTHER CREW MEMBER NOT PERFORMING TO EXPECTATIONS.