We believe that your issue has been closed by the upload of
Version 0.11.1 of grml-autoconfig from Michael Prokop <mika@grml.org>.
The explanation is attached below

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Hash: SHA1

Format: 1.8
Date: Thu, 26 Sep 2013 21:56:21 +0200
Source: grml-autoconfig
Binary: grml-autoconfig
Architecture: source all
Version: 0.11.1
Distribution: grml-testing
Urgency: low
Maintainer: Michael Prokop <mika@grml.org>
Changed-By: Michael Prokop <mika@grml.org>
Description: 
 grml-autoconfig - main bootup process of a Grml (based) system
Changes: 
 grml-autoconfig (0.11.1) grml-testing; urgency=low
 .
   * [9e95af6] Generate symlink /etc/mtab pointing to /proc/mounts
     [Closes: issue1277] Thanks to Michael Biebl for the initial hint
Checksums-Sha1: 
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 bcf44b5babd5e4c60433b62996238f35522347c5 70560 grml-autoconfig_0.11.1.tar.gz
 9be3d42863cfebdcc28c3e3cbf7900343b2374cb 78280 grml-autoconfig_0.11.1_all.deb
Checksums-Sha256: 
 738a77e55e2faa60920b9d013e2c63e00e63ffb5c9254f7b4fe9730b9c20fc07 1021 grml-autoconfig_0.11.1.dsc
 dd851e178cf6def62e92d03db6ce6270fba3e00d4d1dc9bc870bf3a562a56903 70560 grml-autoconfig_0.11.1.tar.gz
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Files: 
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 6bba14d03f4ffd42f09f225406316b04 70560 grml optional grml-autoconfig_0.11.1.tar.gz
 ca4d25c730f2071e41d6bf5981b977d9 78280 grml optional grml-autoconfig_0.11.1_all.deb

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When working on the stable build of Grml 2013.09 I noticed this behaviour:

  http://screeni.s3.amazonaws.com/screenshot.2013-09-26T11:36:15.png

As compared to the output from 2013.09-rc1:

  http://screeni.s3.amazonaws.com/screenshot.2013-09-26T11:38:00.png

Might be related to libudev0 v175-7.2 (as used on 2013.09-rc1) vs libudev1 v204-4 (as used on current dailys).
Doesn't cause any real harm, but assuming the principe of least surprise we should make sure the output is decent for the 
stable release.