AN LR35 FO OFFERS A SAFETY SUGGESTION REGARDING THE REQUIRED POS RPT OVER THE LOM TO THE TWR. CREW FAILED TO DO SO AT MDW; IL.

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THIS IS NOT A RPT OF A CONFLICT. IN FACT; THE CTLING AGENCY NEVER EVEN QUESTIONED THE SIT. I WOULD JUST LIKE TO POINT OUT AN ATC PROC THAT OFTEN GETS SKIPPED OR MISSED; AND THIS IS WHAT OCCURRED TO OUR CREW. WE ARE A PART 91 OPERATOR GOING INTO MIDWAY ON A NIGHT WHERE THE APCH VISIBILITY MINIMUMS WERE CONTINUALLY VARIABLE; ABOVE AND BELOW MINIMUMS. WE DECIDED TO TRY THE APCH AND SEE WHAT THE FLT VISIBILITY WAS. WE WERE GIVEN ABOUT 4 BACK-TO-BACK INSTRUCTIONS FOLLOWED BY THE LAST CLRNC OF 'CLRED FOR THE ILS RWY 13C; CONTACT TWR AT THE FAF.' THE APCH WENT GOOD CONSIDERING THE SNOW SQUALL WE WERE IN; AND WE HAD THE LIGHTS/RWY AT 1;.4 DME -- ABOUT 300-400 FT ABOVE MINIMUMS. TO BE CONSIDERATE WE DECIDED TO LET THEM KNOW WHERE WE HAD THE ARPT; AND WE BOTH REACTED IN THE RUSH OF PROCS THAT OCCURS AT THE FAF THAT WE NEVER CALLED THE TWR. WE QUICKLY DIALED UP THE TWR ON A 1 MI FINAL; GAVE THEM THE RPT. MIDWAY TWR NEVER QUESTIONED WHY WE DID NOT CALL THEM SOONER; THEY JUST THANKED US FOR THE RPT. I AM NOT PUTTING THE BLAME FOR THIS ON ATC. WE; THE CREW; WERE GIVEN AN INSTRUCTION AND DID NOT FOLLOW IT. IT WAS OUR ERROR! BUT; AFTER FLYING FOR ONE OF THE REGIONALS OUT OF ORD AND DFW AND SEEING MANY OTHERS HAVE THIS HAPPEN TO THEM; THE PROC SHOULD BE CHANGED. IN THE TERMINAL AREA; ESPECIALLY IN HARD IFR AT NIGHT; THE CREWS SHOULD NOT BE GIVEN INSTRUCTIONS THAT THEY ARE TO FOLLOW OUT AT A LATER TIME. TELLING A CREW TO CALL THE TWR IN 2 MINS WHEN YOU ARE BEGINNING A DSCNT; WHILE MAKING 4 CONFIGN CHANGES; WHILE RUNNING CHKLISTS AND TRACKING ALTS IS A BAD IDEA. AT SUCH A BUSY TIME FOR THE CREW; ATC NEEDS TO TELL US AT THE TIME WE ARE TO PERFORM THE TASK.