[Plugin: WordPress MU Domain Mapping] Install error

I get this error:

“The domain mapping plugin only works if the site is installed in /. This is a limitation of how virtual servers work and is very difficult to work around.”

but in the changelog as of 0.5 ( http://ww.wp.xz.cn/extend/plugins/wordpress-mu-domain-mapping/changelog/ ) it says your plugin works in a sub directory install.. or “folder” based install also saw this thread:
http://mu.ww.wp.xz.cn/forums/topic/15451 that say it Works on folder based installs… by this are you referring to “mydomain.com/wordpressinstalledhere”? I have WordPress installed in a sub directory and need Domain mapping to work on multisites… this possible?