A tool like that is definitively helpful, though I see a problem: this might result in dozens of posts in mod threads of the kind: "HELP! I found a conflict". The first step is to find those pairs of mods with class files having the same name. The next question is: what to do with this info? Sure - I could kick out one of the mods, but that will be an overkill, I suppose.
Should such cases be reported, and if so - where?