Hello Joost, first off, no way for me to fiddle in the code, that was not an option to start with ;). But I do think that having the ability to show or hide these tabs should be an option. If by example I disable the content bank in the plugins/content bank, then it should hide itself. I did do an overview of what Moodle could do for them, but as a service provider, it is not my role to tell them what they should or not do with their product, but rather try to find a solution, to what seem for them like "a big deal" and really yesterday it seemed like it was catastrophic LOL!!!. The option I had for them was, as you mentioned, disabling access to the content bank, but the question came back "why is the menu item still there" ;) I didn't think you could actually change the name of it, so that might actually be a good alternative...
cheers!