Should the function _pm_download_destination not also create a modules en themes directory?

Hello,

Should in commands/pm/download.pm.inc the function _pm_download_destination not also create a modules en themes directory (next to files)?

Because if I do first

si install --sites-subdir=example

then a dir sites/example is created, but it is not user writable, which I understand. If I then do

-l http://example dl devel --use-site-dir

or

dl devel --destination=sites/example/modules

then I get an error that the modules directory could not be created, and devel will be in sites/all/modules.

Thanks,

Eric J.