For comments, if you are using VuFind 2.0, you can disable the comments tab through the module.config.php
– that’s relatively easy (let me know if you need more specific details and I can look them up). In 1.x, you’ll have to do theme hacks.
For tags, in either 1.x or 2.x, it’s going to take some theme changes to get rid of them – they’re
in quite a few different places. If you’re going to go to all that trouble (at least if you’re working with the 2.x code, since it will continue to evolve), it might make sense to implement a mechanism to disable them from configuration so that we can get
the feature into the main codebase and it will continue to work properly in the future as more things get added as well. If you’re interested in doing that, I’d be happy to discuss my thoughts on how to make it happen.