Some kind of paging function would also be good for mobile devices where RAM is frequently at a high premium.
NodeBB causes not-infrequent browser crashes on my iPad2 on longer threads. When I click a link that takes me to the 60th post in a thread or something, there is a long delay as the slower browser begins by loading the op oldest posts in batches. It would be good if there were a way to make it skip doing that and take me directly to the unread posts (without switching the full application to paged mode).
Perhaps on mobile devices you could add a secondary navigation bar with the paging functions (arrows, "displaying X-Y of Z", etc).
To make nodebb more accessible for people with no knowledge of css it would be cool if themes could have options to customize colors or at the very least have a few preset theme colors.
selecting one of the options would change the whole color scheme of the theme, kinda like bootswatches for vanilla but added by theme makers.
vanilla and lavander are both kinda preset up for this with the use of variables.less
if you could add a way to select 1 of X amount of variable files you achieve this idea.
this would allow people to get more and easier mileage out of each theme, and help designers trying to make pay themes