--with--config-file-scan-dir multiple paths

Hello,

i try to use multiple paths for this configure-switch. I tried with:
--with-config-file-scan-dir=/etc/php5-config:/etc/php5-config-extra

I hoped that common Path-Separator ":" could be used. But php-ignores this 
path completely.
Ist there a way to achieve this?
Background is that i use different php-versions on machine. Some 
php-versions use same ini-scan-dir for additional inis and some should use a 
2nd ini-scan-dir for separat inis.
hmm, ideas?

Thanks,
Andre