As Saurabh says, you can't disable it but you can chose to hide them in
your menu. However, that won't hide all of them in Workspace etc...Most
of those send on the image request, you could actually flush them in
doPlugins just before the server call are generated. However, you can't
flush all and I think it is a little shaky solution...What are you
trying to archive and why don't you want those out of the box variables
set?The best solution would properly be to engage with Engineering
Services,...