It would be nice to

• give user more formatting possibilities beside plain text and html for debug info
• not to presume that index.php will display debug in html mode if "inline" or "popup" is selected in ini file
• allow user to specify a filter to be run on debug output before it is echoed into the results. This way user can echo the debug info inside a javascript or xml comment without fear of it breaking outside of the comment

proposed solution ==>

• in index.php, let eZDisplayDebug() use a new ini var to decide format of debug output, eg DebugFormat. defaults to 'html'. This is orthogonal to inline/popup

• pass the said format as param to ezdebug::printreport and ezdebug::printreportinternal instead of the $as_html param (use polimorphism magic to keep api backwards compatible, translating true => format = "html" and false => format = "text"

• add a filtering mechanism on debug output based on a new ini setting (as a new function of ezdebug)