What would be the best approach to enable/disable this on a per category basis? We’d like to have a more complex “polis-like” mechanism in some selected areas of our social intranet, but don’t want to detract from the welcoming and positive nature of “just likes” for the rest of the categories.
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There is no such feature. A quick way to do it would be to hide the reactions selector with CSS, such as:
.category-general-resources .discourse-reactions-picker {
display: none;
}
If you want to iterate through multiple categories and make it easier to maintain, you can use a SCSS loop like this:
$categories: 'general', 'site-feedback', 'staff';
@each $category in $categories {
.category-#{$category} .discourse-reactions-picker {
display: none;
}
}
The category class is visible in the <body> tag.
It can be circumvented by any user that knows how to make it visible again client-side, but if your community is well-behaved, I think it’s a good workaround. 
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Have you looked at some other options in discourse to achieve what you want, such as:
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This worked surprisingly well, thank you very much for this approach.
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