Today a developer by the name of MCLUB released a brand new tool to remove your uneeded, unwanted MultiMan covers.
Quote (MCLUB):
My Tool can Clean Index Cover Folder in JPG/PNG
-Step1 put "MM Cover Index Cleaner (JPG) 1.00 by.MCLUB.exe" in Folder (JPG) or (PNG)
-Step2 Start Programm
-Step3 Press Enter
This Clean (34 bad id) Covers from 4391 to *4357 MM Covers* Good for Cover Index Cleaner
Very Big thanks goes to *deank* best ever Homebrew and Loader on PS3 !!!
Cover Updates Coming Soon...*