POSSIBLE CLASS D AIRSPACE INCURSION BY GA PLT WHILE WAITING FOR AN IFR CLRNC OR LAL TO BE RPTED AS VFR.

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AN IFR FLT PLAN WAS FILED WITH DUATS AT XA15 WITH THE NOTE FROM DUATS THAT IT WOULD BE FORWARDED TO ZMA. WHEN I ARRIVED AT THE ARPT (WHICH IS UNCTLED) I CALLED ORL APCH ON A RADIO/PHONE LINE AND ASKED FOR CLRNC. THEY DID NOT HAVE THE CLRNC. BEING THAT THE FOG WAS CLRING WELL AT THE FILED DEST AND IT WAS A SHORT FLT; I DEPARTED VFR. AS I APCHED LAL 30 MI OUT; I GOT A RPT FROM LAL ATIS THAT THE VISIBILITY WAS 1/2 MI; SO I CALLED TPA APCH FOR AN ILS. THEY HAD JUST CLRED ANOTHER PLANE FOR THE APCH. THEY GAVE ME A SQUAWK CODE AND TOLD ME THEY WOULD WORK ME AROUND FOR THE APCH. WHEN I WAS WITHIN 5 MI OF THE FIELD; WHICH I COULD SEE QUITE WELL; APCH SAID THEY COULD NOT GIVE ME THE ILS BECAUSE 'IT WAS NOT VFR.' BEING THAT I WAS NOW ENCROACHING UPON CLASS D AIRSPACE; I SWITCHED TO TWR FOR A LNDG. TWR TOLD ME THAT THEIR EQUIP WAS STILL ONLY INDICATING 1/2 MI YET FLT VISIBILITY WAS WELL OVER 5 MI. BUT BY THE TIME WE FINISHED THE CONVERSATION; THE FIELD HAD OPENED FOR VFR; IMAGINE THAT. THE TWR ASKED ME TO CALL ON THE GND AND WE REDISCUSSED THE SIT BUT NOTHING WAS RESOLVED. I SENT AN E-MAIL TO A PLT GROUP THE NEXT DAY TO CHK UP ON THIS SIT. WHEN THEY PULLED THE TAPE UP; I HAD INADVERTENTLY ENTERED LAL AS DEP AND DEST; YET IT STILL SAID IT WAS FORWARDING THE FLT PLAN TO ZMA. THE RESEARCHER SAID IF THE 2 IDENTS ARE THE SAME; CTR COMPUTER JUST DROPS THEM INTO A 'BLACK HOLE.' THIS CAUSES 2 PROBS: 1) IT GIVES YOU A FALSE SENSE OF SECURITY THAT YOU HAVE A FLT PLAN WHEN YOU DO NOT. 2) SOME ARPTS REQUIRED SAME IDENT FLT PLANS WHEN CONDUCTING PRACTICE INST APCHS; ESPECIALLY IN IFR CONDITIONS. BACK TO TPA APCH; IN SEVERAL OTHER OCCASIONS; OTHER APCH CTLS HAVE BEEN ASKED TO ISSUE AN ILS APCH AND HAVE DONE SO READILY.