control the quota per role when users use filefield or imagefield

Hi:
i am working on a site dealing with images.
i create new content type called images, i add imagefield to allow users to upload images. then i make a gallery using views.
the task is:
is there any way to limit the users uploads?
as we know we can limit uploads per file and that ok for one file. if we use the upload (which is included in drupal core) we can make limitation per role.
but here in this case we can't make limitation depending on role, because the upload method is not working through the core upload but through the imagefiled.
if we take look where files are store we can notice that all images are stored in sites/all/files ... if we use image cache we will see that every image store in a folder.
so how we can make the limitation?
i take a look at : http://drupal.org/project/node_limit and http://drupal.org/project/node_limitnumber but they are not waht i talk about
by the end i can summary the task as follow
control the quota per role when users use filefield or imagefield
wish you to help me