We believe that your issue has been closed by the upload of
Version 0.9.14 of grml-autoconfig from Michael Prokop <mika@grml.org>.
The explanation is attached below

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Format: 1.8
Date: Sat, 16 Oct 2010 18:57:15 +0200
Source: grml-autoconfig
Binary: grml-autoconfig
Architecture: source all
Version: 0.9.14
Distribution: unstable
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 (0.9.14) unstable; urgency=low
 .
   [ Frank Terbeck ]
   * [67efa58] Fix config_debs() and make sure config_debnet() does not
     globally set options. [Closes: issue892]
 .
   [ Ulrich Dangel ]
   * [9c5f2cc] Fixed typo in manpage.
   * [86a6099] Swap position of pre-2009.05 and post-2009.05.
   * [6e63506] [e200e8e] [e200e8e] Provide variable NETSCRIPT for
     downloaded and executed script. [Closes: issue913]
   * [d019c32] Added test for the config_debs function to test the
     parameter count for the dpkg command.
 .
   [ Christian Hofstaedtler ]
   * [7920da3] Document run-parts restrictions for script= option.
     [Closes: issue906]
 .
   [ Michael Prokop ]
   * [5365fba] doc/grml-autoconfig.1.txt: no longer include
     grml-autoconfig.200905.txt. [Closes: issue891]
   * [3c76bd3] Bump Standards-Version to 3.9.1.
   * [95cf665] Add zsh to Build-Depends-Indep for tests.
   * [82bbb6e] tests/test_debs.sh: provide einfo/eend wrapper for
     non-existing grml-etc-core files /etc/grml/lsb-functions and
     /etc/grml_colors.
Checksums-Sha1: 
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 2c7a7c47cb1f626d31c96019a97b40aebafe27d0 73967 grml-autoconfig_0.9.14.tar.gz
 c1560c8bcc3a100ceb1d031a2dbda29a1e898099 87690 grml-autoconfig_0.9.14_all.deb
Checksums-Sha256: 
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Files: 
 f73e2568a650faed23fbb3b44760bb82 958 grml optional grml-autoconfig_0.9.14.dsc
 0b8fd1c141f4fac1800e9ef6fe98badd 73967 grml optional grml-autoconfig_0.9.14.tar.gz
 46ea69a59a5029db4808662db0438df5 87690 grml optional grml-autoconfig_0.9.14_all.deb

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Thanks for your patch, fixed in git.

Documentation patch.

The manpage for grml-autoconfig does not mention filename restrictions for the 
executed scripts for the script parameter.