dompdf font cache

The 0.6.0-alpha version of dompdf (seems someone has picked up the ball again) attempts to write cached versions of font files out into [dompdf-root]/lib/fonts. The tarball has all the folders group writable; but as of this writing, the code makes no attempt to test whether that directory is writable. see: http://groups.google.com/group/dompdf/browse_thread/thread/0913f5f2eba8c067

Would you please consider adding a warning in your install documentation about the need for this folder being writable by httpd?

Thank you.