It seems like this menu should get a scrollbar. Fortunately, you can use your middle-mouse button to scroll down it, but if someone’s MMB wheel is busted or they don’t know the list is longer, they may never see all the maps that are installed. Usability-wise, it just makes sense to add a scrollbar, imo…
And, if it helps, there are other areas of the game where a scrollbar already gets utilized, like here, when choosing a Game Mode. The list is longer than what fits in the box, so a scrollbar is provided:
