as my game library is huge and the current category/tag system is kind of lacking, I would like to suggest an improvement

what I'd like to see is having a customisable toolbar right above your games list where you could see your tags as BOXES, and you could drag & drop games from the list into them (much faster than currently assigning tags)

clicking the box would of course show you all the games with the given tag

there could also be "fixed" boxes for the current GOG categories, like Adventure, Action etc. - those would be prefilled automatically