I don't know if this could present a problem: as a test I just added a comment to my "Dutch Pritlog"-blog, calling myself "Chris" and using the same password as mine. The user "Chris" was accepted,thanked for his comment and reminded not to forget his password..
So now "Chris" and I share the same password. I don't mind, as "Chris" doesn't know we have the same pass :) But couldn't this lead to confusing the software or making users identities more vulnerable?
http://verbertus.000hosted.com/blog-NL/index.php?option=viewEntry&filename=00005