C90 CTLR EXPRESSED CONCERN REGARDING THE LACK OF TIMELY AND PROPER INFO ON THE IDS4; FREQ OVERRIDE ISSUES AND CLASS B EXITS DURING SIMULTANEOUS PROCS.

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I WAS WORKING THE L PARALLEL MONITOR POS BTWN XA00 AND XB00 LCL TIME ON JAN/SUN/07. WHEN I FIRST OPENED THE POS THE RWYS WERE CONTAMINATED WITH A SNOW AND ICE MIX; BUT THE MONITORS WERE NOT YET IN USE BECAUSE ONLY 1 RWY WAS IN USE. THE IDS4 EQUIP AT THAT TIME SAID THE RWYS WERE JUST WET. WHEN THE SECOND RWY WAS PUT INTO USE; AND THE MONITORS WERE NEEDED THE RWYS WERE TREATED AS IF THEY WERE JUST WET. THE DIFFERENCE BTWN WET AND CONTAMINATED CHANGE OUR SEPARATION STANDARDS AND ARE IMPORTANT TO BE KEPT APPRISED OF. THE DOWNWIND LEG OF THE PATTERN WAS GOING OUT PAST 20 MI AS REQUIRED; AND EVERY ACFT WAS EXITING THE CLASS B AIRSPACE BECAUSE IT DOESN'T EXTEND BEYOND 20 MI. AS REQUIRED THE ARR CTLR WAS ADVISING EVERY ACFT THAT THEY WERE EXITING THE CLASS B AIRSPACE. THE ACFT WOULD THEN BE CLRED FOR THE APCH AND BE CHANGED TO THE TWR FREQ FOR MONITORING. THIS IS WHERE THE PROB BEGINS. AFTER THEY ARE ON THE MONITOR THE ACFT THEN REENTER THE CLASS B AIRSPACE; AND BY REQUIREMENT THE MONITOR HAS TO TELL EACH ACFT THEY ARE REENTERING THE AIRSPACE. WHEN I DO THIS IT CREATES A POTENTIALLY DANGEROUS SITUATION WHEREBY I AM OVERRIDING THE TWR CTLR TO ADVISE THE ACFT THAT THEY ARE REENTERING THE CLASS B AIRSPACE. IF THE TWR HAD A SITUATION THAT REQUIRED IMMEDIATE CTL INSTRUCTIONS THE MONITOR COULD POTENTIALLY BE ON THE FREQ; AND THIS COULD HAVE DISASTROUS CONSEQUENCES.