LAST MIN RWY CHANGE. ACFT AT 400 FT; 1.3 MI FROM RWY; PLT REFUSED. TWR RECLRED ACFT TO LAND ON ORIGINAL WAY.

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ILS APCH TO LAX RWY 24R WITH CLRNC TO LAND; INSIDE FAF; TWR ASKED FLT TO RPT WHEN RWY BECAME VISIBLE AND CLOUD BASE. CAPT (PNF) RPTED APPROX 600 FT AND A LITTLE LESS THAN 2 MI. LAX TWR THEN STATED 'SWITCH RWYS AND LAND RWY 24L FOR TFC.' CAPT DECLINED CLRNC STATING HE WOULD GAR IF UNABLE LAND STRAIGHT AHEAD PER PREVIOUS CLRNC. LAX THEN RECLRED FLT TO LAND ON RWY 24R. CLRNC TO SIDESTEP WAS TECHNICALLY ILLEGAL -- PUBLISHED SIDESTEP MINIMUMS ARE 660 FT; AND INHERENTLY DANGEROUS AT NIGHT IN LESS THAN VFR CONDITIONS WITH CREW NOT PREPARED PRIOR TO BEGINNING APCH WITH SIDESTEP EXPECTED AND PROPERLY BRIEFED. EFIS/FMC GLASS COCKPIT ACFT ALSO NOT OPTIMALLY ENGINEERED FOR 'LAST MIN' RWY CHANGES (LOSS OF GUIDANCE AND APCH AIDS REQUIRED BY FARS AND COMPANY POLICY FOR IFR CONDITIONS). FINALLY; NONMANDATORY/CRITICAL COMS INITIATED BY ATC DURING FINAL APCH DISRUPTIVE TO SAFE CONCLUSION OF MANEUVER -- IF TWR NEEDS FLT TO GAR; THEN SHOULD JUST SAY SO -- IF TFC FLOW DEMANDS ADJUSTMENT; REVISED CLRNC SHOULD BE GIVEN TO ACFT NOT IN CRITICAL FLT PHASE AND DEFINITELY NOT INVITE ILLEGAL; VIOLATION TYPE COMPLIANCE BY ANY ACFT.