MD80 FLC QUESTIONS HOLD SHORT POS POLICY AT LGA.

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DEP ATIS WAS VISIBILITY 10 SM; CLOUDS 3700 FT/25000 FT; ALTIMETER 30.35; ILS RWY 4 APCH IN USE; LOC 4 DEPARTING RWY 31. MY FLT PUSHED OFF GATE AND CALLED LGA GND CTL FOR TAXI. WE WERE INSTRUCTED 'TAXI TO RWY 4 VIA TXWYS A; E; B.' ATIS WAS ADVISING RWY 31 DEPS; BUT THERE WAS A CHANGE TAKING PLACE; AND RWY 4 WAS NOW GOING TO BE USED FOR DEPS; AS GND CTL ADVISED US. WE WERE GIVEN NO CLRNC TO HOLD SHORT OF RWY 4 AT THE RWY 4 ILS HOLD LINE; AND SINCE WX WAS VFR WE HELD SHORT OF RWY 4 AT THE RWY 4 'B4' HOLD LINE. THERE WERE ALSO NO INSTRUCTIONS ON ATIS TO HOLD SHORT OF RWY 4 AT THE ILS HOLD LINE SINCE ATIS WAS SAYING DEPS WERE ON RWY 31; NOT RWY 4. AS WE HELD SHORT OF RWY 4 SHORT OF THE B4 HOLD LINE BUT BEYOND THE ILS HOLD LINE; LGA TWR ADVISED A TURBOPROP ON SHORT FINAL TO LNDG AT RWY 4 TO GO AROUND. THEN THE LGA TWR ADVISED US WE WERE BEYOND THE RWY 4 ILS HOLD LINE AND THAT WE SHOULD TAXI ONTO RWY 4 AND MAKE A R TURN AT TXWY C4 FOLLOWED BY A R TURN ONTO TXWY B AND HOLD SHORT OF RWY 4 AT THE ILS HOLD LINE -- SO THAT IS WHAT WE DID. LATER; UPON ARRIVING AT OUR DEST; I CALLED LGA TWR AND ASKED FOR THE SUPVR. I BRIEFED HIM ON OUR SIT ON TAXI OUT AT LGA; AND ASKED HIM IF HE CONSIDERED THE SIT A PROB. HE SAID HE WAS THE SUPVR ON DUTY AT THE TIME WE TAXIED OUT; AND HE SAID THE GND CTLR HAD ERRED IN NOT TELLING US TO HOLD SHORT OF RWY 4 AT THE ILS HOLD LINE. IT WAS ABSOLUTELY NOT OUR FAULT NO ACTION WAS BEING TAKEN AND THAT ONCE THE GND CTLR NOTICED THAT WE WERE SHORT OF RWY 4 BUT BEYOND THE RWY 4 ILS HOLD LINE; THAT THEIR LCL POLICY DICTATED THAT THE LNDG TURBOPROP BE GIVEN A GAR; SINCE THERE COULD BE A WINGTIP CLRNC PROB WITH A WDB LNDG ON RWY 4 AND A WDB HOLDING SHORT OF RWY 4 BUT HOLDING BEYOND THE ILS HOLD LINE. NEITHER OF OUR ACFT WERE WDB'S. IF LGA GND HAS THIS POLICY; WHY NOT PRINT ON THE ARPT CHART TO HOLD SHORT OF THE ILS HOLD LINE AT RWY 4 WHEN LNDG RWY 4 VFR OR IFR WX. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: TWR PERSONNEL RPT THAT THE ILS HOLD LINE IS TO BE ADHERED TO ONLY WHEN RWY 4 IS USED FOR ARRIVING AND DEPARTING TFC; REGARDLESS OF WX CONDITIONS. THIS REQUIREMENT IS DUE TO WINGTIP CLRNC LIMITS FOR ALL ACFT TYPES; NOT JUST WDB. WHEN TFC IS DEPARTING RWY 4 AND LNDG ANY OTHER RWY; THE 'B4' HOLD LINE BECOMES THE STOP POINT FOR ALL DEPARTING TFC. THE TWR PERSONNEL STATE THAT PLTS ARE NOTIFIED AS TO WHICH HOLD LINE IS ACTIVE VIA ATIS RECORDING.