CAPT RPTR REF TKOF AND LNDG SPACING AND HAZARD IF MISSED APCH NECESSARY.

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IT IS MY CONTENTION THAT THE BOS TWR IS CONDUCTING HAZARDOUS INTERSECTING RWY OPS. THIS IS BASED ON MY EXPERIENCE FROM AN ARR IN BOS ON APR/XX/94 AT APPROX XY40Z. WE LANDED ON RWY 27. TKOFS WERE BEING CONDUCTED ON RWY 22R. ON SHORT FINAL; I NOTICED AN ACFT ROLLING ON 22R. AS WE TOUCHED DOWN; THAT ACFT WAS STILL ON THE GND. AS WE STARTED OUR DECELERATION ON ROLLOUT; THE OTHER ACFT CROSSED THE EXTENDED CTRLINE OF RWY 27 AT 100 FT - 200 FT CLBING. IT WAS APPARENT TO ME THAT; IF FOR SOME REASON; WE HAD ELECTED TO GAR JUST BEFORE TOUCHDOWN ON OUR APCH; THAT WITHOUT AN EXTREME EVASIVE MANEUVER ON OUR PART; WOULD HAVE RESULTED IN A CERTAIN MIDAIR COLLISION. POSSIBLE REASONS FOR GOING AROUND WOULD BE UNAUTHORIZED VEHICLE ON THE RWY OR A BOTCHED HIGH AND FAST APCH TO A SHORT RWY. THE SIT WOULD BE FURTHER EXACERBATED IF THE LNDG/GAR ACFT WAS UNAWARE OF THE TKOF TFC. THIS IS PROBABLY ONE OF THOSE SCENARIOS THAT HAS BEEN TAKING PLACE FOR A LONG TIME WITHOUT INCIDENT; AND ONLY AFTER THE ACCIDENT WILL ALL CONCERNED EXPRESS AMAZEMENT THAT NO ONE HAD RECOGNIZED THE POTENTIAL FOR AN ACCIDENT. I RECOMMEND THAT ACFT NOT BE CLRED FOR TKOF UNTIL LNDG ACFT ON THE GND.