I figured it out.
By default the form runs as the IIS IWAM local account(which of course can't have permissions remotely). If you change this to a network account in IIS and then give the remote folder the same network account permissions, BAM... you can write remotely. Thanks for helping me brainstorm boys
Comment on Re^3: advice, writing to remote share (RESOLVED)
For what it's worth, I've found that mapping drives is often not required as many Perl functions such as "glob", "open", "copy", "unlink" and "tempfile" (for example) work fine using Windows UNCs (\\server\share\file). Kind of nice to skip the drive letter mapping altogether.
Note: it's sometimes necessary (if not preferred) to swap back-slashes with slashes in UNCs. (//server/share/file).