apache --suexec-safepath configure option

[ml at sd2i.com]

I can see the following in the Makefile of www/apache13 :

APACHE_SUEXEC_DOCROOT?=${DOCUMENT_ROOT}
APACHE_SUEXEC_LOG?=/var/log/httpd-suexec.log
APACHE_SUEXEC_USERDIR?=public_html
APACHE_SUEXEC_UIDMIN?=1000
APACHE_SUEXEC_GIDMIN?=1000
APACHE_SUEXEC_CALLER?=www

SUEXEC_CONF=    \
        --enable-suexec \
        --suexec-docroot=${APACHE_SUEXEC_DOCROOT} \
        --suexec-caller=${APACHE_SUEXEC_CALLER} \
        --suexec-uidmin=${APACHE_SUEXEC_UIDMIN} \
        --suexec-gidmin=${APACHE_SUEXEC_GIDMIN} \
        --suexec-logfile=${APACHE_SUEXEC_LOG} \
        --suexec-userdir=${APACHE_SUEXEC_USERDIR} \
        --suexec-safepath=${DEFAULT_PATH}  

My question is how can i change the --suexec-safepath from an option 
without doing changes in the Makefile itself ?
Ideally i would have the possibility to insert the path into 
pkgtools.conf so i don't need to change anything when doing an upgrade 
of the port with portugrade.

Beside my request, is there a reason for the maintainer to not provide a 
APACHE_SUEXEC_SAFEPATH option like for other suexec config values ?

Regards,
David.