JÖ,
I just ran across a post that claims to answer your question about changing the path to the active php.ini file:
http://moodle.org/mod/forum/discuss.php?d=90435#p399550
EDIT: Another post in the same thread mentions another environment variable that might work in systems other than Windows as well, and even in Windows promises to be more convenient because you wouldn't need to edit the registry:
http://moodle.org/mod/forum/discuss.php?d=90435#p399594
RLE
Installing and upgrading help
Help needed - problems with installation ( gd2.dll)
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