XnView Software

I teach 3D Animation and Fine Arts at an NGO, Helen Keller Institute for the Deaf and Deadfblind, Mumbai. We rely 90% of our time using your software for our extensive reference libraries because all my students are deaf and illiterate. XnView MP is the ultimate software for deaf people, we are using XnView MP on our Network on both Linux and Windows, with all our references on our server, we have set all our systems XnView data files in the same location on our Server (..create a category and watch it pop up on all systems) which makes XnView MP Rock! My students dont have permission for writing or deleting files however we have created an AppData folder on server where they can write to XnView.db etc. files, it take allot of our time setting up our own Categories and teaching our students how to create and remove files from their own Categories. The problem we face is that at times our students can be quite trigger friendly or forgetful and instead of right clicking 'Remove From Categories" (their own category) they click 'Remove From All Categories', which can be quite a pain for us. It would be a huge help if we can disable the right click 'Remove From ALL Categories' option.
We would love all the help you can give us from the best Image Organizer in the World!
thanks,

ok, i'll add a setting to remove it