Aw ni ce! @Bettina @Caroline @Serge !
I added an emoji reactions feature. You can now hover (desktop) or long-press (mobile) the heart icon/button at the bottom a post to choose decent kinds of emoji reactions 
Like this:
I chose 5 that I thought would be a good fit.
I hope it helps make the Forum a bit closer to a mobile chat experience in a way that you all might want