I’ve ended up using the widget, but came across a problem. I’m on Multisite and basically have two blogs which are technically clones. They use the same plugins, the same theme etc, just the content is different.
I didn’t enable your plugin in the network, but instead I’ve activated it on each of the blogs. Then I’ve copied all the YARPP and WRI settings exactly. On the second blog the widget doesn’t even show up. Where could be the problem?