Imagecache preset selection for profile picture

I'm trying to add the crop tool for the users of my site so they can crop their profile image to 85x85. The issue is that when the pop up is loaded, the user can select all the cropping presets I have set in Imagecache. They can select:

posts_crop_1
posts_crop_2
posts_crop_3
avatar

I just want them to crop their image with the "avatar" preset, as the other presets are only for cck image fields I have in different type of nodes.

When setting the cropping presets a image can use, I can select them in the field config section Imagecrop (in content/node-type/my_content/fields/my_image).

How can I limit the presets than should be used for the profile picture? I have selected the correct preset also in admin/user/settings (every field for profile picture is set to "avatar"), but when the javascript crop pop up loads, it allows the user to crop his image for every preset on my site, not just the "avatar" one.

Is this a bug? Am I doing something wrong? If I have selected just one preset for profile image I understand that no other should be available for cropping for this kind of images.