B757-200 CREW OVERSHOT THE XING RESTR TO CROSS ORL AT OR ABOVE 2500 FT ON VISUAL APCH TO RWY 18R.

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DEV FROM CLRNC ALT. ON DOWNWIND FOR ILS RWY 17L AT MCO; ORLANDO APCH CHANGED THE APCH TO ILS RWY 18R; GS INOP. TO AVOID A CELL; WE ACCEPTED A 90 DEG HDG CHANGE WHICH PUT US ON A VERY TIGHT BASE LEG. DSNDING BELOW THE CLOUD BASE; WE SAW THE ARPT; AND ORL APCH ISSUED A CLRNC FOR A VISUAL APCH TO RWY 18R. WE ACCEPTED THE APCH; AND THEY ADDED NOT TO DSND BELOW 2500 FT MSL UNTIL AFTER ORL VOR. WITH THE VERY TIGHT BASE LEG WE WERE DSNDING RAPIDLY TO BE READY FOR THE ON PRECISION APCH TO RWY 18R; WHICH HAS A STEPDOWN ALT TO THE FAF OF 2200 FT MSL. WE WERE UNABLE TO LEVEL OFF AT THE 2500 FT MSL RESTR; AND DSNDED TO APPROX 2300 FT MSL BEFORE LEVELING OFF. THE ORL VOR IS INSIDE THE FAF; WHICH OBVIOUSLY PUTS YOU ABOVE THE PROFILE FOR THE INST APCHS TO RWY 18R. ORL APCH NEEDS TO CONSIDER THE WORKLOAD OF CREWS DURING TSTM AVOIDANCE; AND MINIMIZE LAST-MIN RWY CHANGES. ALSO; RECEIVING AN ALT RESTR THAT IS ABOVE THE CHARTED APCH ALTS IS NOT AN EXPECTED CONDITION; AND IF IT IS A ROUTINE CLRNC FROM ORL APCH; THEN MAYBE IT SHOULD BE INCLUDED AS A NOTE ON THE RWY 18R APCH PLATE. SUPPLEMENTAL INFO FROM ACN 620560: THEY THEN VECTORED US THROUGH AN AREA OF CLOUDS AND IMMEDIATELY IN FRONT OF A LARGE CUMULO NIMBUS CELL. WITH 90 DEGS OF TURN TO GO TO ALIGN WITH RWY 18R; ORL APCH ISSUED (AND WE ACCEPTED) A VISUAL CLRNC TO RWY 18R. ORL APCH THEN CLRED US TO CROSS THE ORL VOR AT OR ABOVE 2500 FT. WE ACCEPTED THE CLRNC. LESSON LEARNED: WE SHOULD NOT HAVE ACCEPTED THE ALT RESTR.