here simple:
in your cube root folder (were the exe, or the icon you click on to access the game [this will be under my programs]), go to the data folder. In this folder click the item named menu, then select program from computer, and choose notepad (if you have opened a *.cfg, or know what you are doing ignore the above). Then look through this text til you find the keywords newgui maps (you can you the search tool by hitting ctr + f). You will see brackets (these things: []) Add this code right above the bracket that that close (]) the newgui maps:
guitab "My Maps"
myMaps = "all the maps you want to add to the menu"
// put in spaces between each name
genmapitems $myMaps
Ok not getting to complicated, this basically ask for a new tab, like: maps, more, 1, 2, ..., then ask for an array of map names (array means generally a list). Then it calls a function to create a button and a picture for each of the the maps :) from the list of course :p
Save the cfg file, (ctr + s) and then load cube. If it does not work type /exec data/menu.cfg into the chat, (by pressing t). If it still does not work reread the post.
Humble Master
chasester