Marking as won't fix, no one came up with a "yes, please GO" or a config nor do 
we enable modelines in our config nor is the securemodelines.vim available on 
grml-small nor grml-medium. Please feel free to reopen if you come up with 
feedback or a solution.

% dpkg -L vim-scripts | grep securemodelines
/usr/share/doc/vim-scripts/html/plugin_securemodelines.vim.html
/usr/share/vim-scripts/plugin/securemodelines.vim

We should think about activating this script by default and disable modelines 
by default instead. [Idea by gebi]