I wish we could add Learnable Meta or Campaign-style trivia blurbs to custom maps.
I have a horror-movie themed map I made way back in 2018 or 2019 that I've since expanded to also include reportedly haunted locations and other "creepy" places. Since it's so old, I can't always remember the reason why I added certain places.
One of the things I actually do like about Campaign mode are the little blurbs you get at the bottom of the screen that give you information about the location, because I like trivia and I've actually learned some interesting things from that. It would be neat to have the option to add those to custom maps – maybe they could show up after the round is over as to not make things too easy, like the A Learnable Meta plugin.