Hi Robb,
Thank you for the post and info... Generally if there ever is a security concern we usually request that its directed directly to us instead of making a big announcement about it... but...
In this case yes, the files are uniquely named with a filename that is (Generally speaking) considered to be secured enough of a name that nobody could ever replicate/duplicate that name.
Now... I can understand your concern though, and we will review adding this to future versions or patches. Possibly an optional feature to choose either the map path or choose the sub folder under the main root path.
Thanks,
Chad