A TWR CTLR'S RPT ON POTENTIAL CONFLICTS OCCURRING ON THE GND DUE TO THE LACK OF PROPER COM SKILLS EXHIBITED ON CTAF DURING TWR CLOSURE TIME AT MMU; NJ.

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THIS IS BECOMING A REGULAR EVENT AT MMU ARPT. BEFORE THE TWR OPENS; ACFT TAXI ABOUT THE ARPT; CROSSING RWYS; WITH NO ANNOUNCEMENTS ON THE CTAF. ALSO NUMEROUS CORPORATE JETS LND AND DEPART WITHOUT MAKING ANY ANNOUNCEMENTS ON THE CTAF. I AM IMAGINING THAT THEY MUST BE USING THE 'I DON'T HEAR ANYONE SO NO ONE MUST BE AROUND BUT ME SO WHY BOTHER ANNOUNCING.' IT IS MOSTLY CORPORATE JETS AND TUBOPROPS THAT ARE FAILING TO USE THE CTAF AND AS TFC CONTINUES TO INCREASE AT MMU; AN INCIDENT IS IN THE MAKING. MAYBE IT IS TIME TO REMIND ALL PLTS; ESPECIALLY THE CORPORATE PLTS; THAT USING THE CTAF IS IN THEIR BEST INTERESTS AS IT CAN PREVENT ACCIDENTS FROM HAPPENING. AND THE CTAF IS NOT JUST FOR LNDG OR TKOF BUT SHOULD ALSO BE USED WHEN TAXIING AROUND ON THE ARPT; ESPECIALLY IF CROSSING A RWY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: TWR PERSONNEL GIVE LECTURES AT THE SCHEDULED FAA SAFETY SEMINARS BUT THIS ALONE IS NOT ENOUGH. THE BASIC PROB SEEMS TO BE THAT PLTS OR FLCS ARE NOT SELF ANNOUNCING WHILE ON TAXI OPERATION; EITHER PRIOR TO TKOF OR AFTER LNDG. CROSSING OF RWYS IS SELDOM PREANNOUNCED. ONE INCIDENT RECOUNTED WAS THE APCH LNDG ON RWY 23 BY A CORPORATE G-1 WHILE A LEAR JET WAS ROTATING OFF OF RWY 05. RPTR SAID IT WOULD BE GREAT IF CORPORATE AND GA PLTS COULD GET THE MESSAGE ON THIS BEFORE SOMETHING TRAGIC OCCURS.