[dokuwiki] Documenting 'dangerous' options in the Config Manager

Hi list!
A few days back a patch of mine was pushed which flags all 'dangerous' config options in the config manager. There are three categories: * 'Danger' means, a newbie won't be able to change it back and will get shut out or the site will get unusable. * A 'warning' marks all changes which could cause unintended behaviour and will probably not get noticed right away. * And then there are the 'security warnings' which calls attention to security risks.
I noticed not all of these options are properly documented on dokuwiki.org. Could some of you please find the time to document at least these 'dangerous' options and explain why they are 'dangerous' and what else should be known about them?
I uploaded the same three icons to dokuwiki.org which are used to flag these issues in the config manager, so you can use the following in each of the config pages to ensure their recognition value: 
{{:config:danger.png|danger}}
{{:config:warning.png|warning}}
{{:config:security.png|security}}

The options are:

_Danger_
* basedir
* baseurl
* savedir
* useacl
* authtype
* superuser
* userewrite

_Warning_
* start
* camelcase
* deaccent
* sepchar
* compression
* xsendfile
* renderer_xhtml

_Security_
* allowdebug
* htmlok
* phpok
* iexssprotect
* xmlrpc

Thanks,
Anika
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