These are two simple bash scripts to be run outside cube. They will scan packages directory and generate a file map_list.cfg with a two-level menu system listing all installed maps.
These bash scripts were only tested on Linux. They may work anywhere else where bash, find, sort and tr programs are available.
How to use:
Add this line at end of "autoexec.cfg":
exec map_list.cfg
Bind showmenu map_list to some key or something.
Go to cube directory (the directory that holds "cube_unix" file) and run ./update_map_list. This command will generate the "map_list.cfg" file. Repeat this whenever you want to update the map list.