DEN TWR CTLR ALLOWED A B737 MEDICAL EMER TO LAND WITH AN A319 STILL ON THE RWY ROLLING OUT.

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CONFIGN: LNDG CONVERGING PARALLEL APCHS TO RWYS 16L; 16R; 26; AND 25. THIS IS A BAD CONFIGN WITH NO OUT SHOULD SOMETHING GO WRONG. ACR Y WAS A MEDICAL EMER. HE WAS VECTORED FOR A VISUAL APCH TO RWY 26 BEHIND ACR X. I DID NOT RECEIVE HDOF ON ACR Y UNTIL 3 MI FINAL. SPACING BEHIND ACR X (WHO WAS LNDG) WAS VERY TIGHT. THERE WERE ACFT LNDG RWY 25 PARALLEL TO BOTH ACR X AND ACR Y. THERE WERE NUMEROUS ACFT LNDG ON RWYS 16L AND 16R. ALL ACFT ON THESE 3 RWYS WERE ON OTHER FREQS. I ELECTED TO ALLOW ACR Y TO LAND EVEN THOUGH ACR X WAS STILL ON RWY (8000 FT AHEAD) BECAUSE THIS WAS SAFER THAN SENDING ACR Y AROUND. THIS WAS DUE TO THE MEDICAL EMER AND THE OTHER NUMEROUS SEPARATION PROBS I WOULD HAVE IF EITHER ACR X OR ACR Y WENT AROUND. I BROUGHT THIS TO MY SUPVR'S ATTN BEFORE ACR Y LANDED TO ENSURE HE DID NOT HAVE A PROB WITH IT. HE THEN WATCHED THE OP. I TOLD HIM I JUST HAD A DEAL WITH BOTH ACR X AND ACR Y ON THE RWY. HE SAID 'DON'T WORRY ABOUT IT; NO YOU DIDN'T.' WHILE I BELIEVE THIS WAS AN OPERROR; IT WAS WITHOUT QUESTION THE SAFEST ALTERNATIVE FOR THE SIT I WAS HANDED. THIS CONFIGN HAS BEEN CHALLENGED IN THE PAST FOR PRECISELY THE ABOVE REASONS.