Nice domain!
As a previous user of the Rain theme, I preferred the theme animations to be off.
I'd probably also recommend changing the node icons to crosshairs (this?) and adding a bit of gaming imagery - maybe using a slider when you add a bit more content.
Finally maybe one or two other...
I can try and look in to it.
In the meantime, you could edit the template modification to something like this:
<xf:if is="$xf.mobileDetect && !$xf.mobileDetect.isMobile() && in_array($category.category_id, [X,Y,Z])"> is-active<xf:else />{{ $isActive ? ' is-active' : '' }}</xf:if>Changing X Y Z...
I was rummaging through some old downloads, and happened upon this:
https://xenforo.com/community/resources/eae-add-ons-post-subject.8335/
I was wondering if something similar to this could be an option? 🤔