image default link type problem

I got a dilemma here… I tried to set the image_default_link_type to none but when i use the plugin where it calls the media drawer to set a category image, because the link is set to none, even i click “use this image” it won’t work, I must click the “file” button in the link to mkae it work, but I am doing a multisite , users in the network will not know how to deal with this issue, either I change the image_default_link_type back to file so that people can set the ctageory image, but then they will again have to click “none” everytime in the link section in the media drawer to avoid the file being linked to image… are there better way to do it?