TheJoe: We'd recommend that you download it, we use a few custom maps on the server and the map pack contains them all. That said, a custom map can only be played when an admin is present on the server to change to one. But it's not too important.
I'll go through the map folder and upgrade maps and check and see what's worth it and we'll make some of them available for player nomination and vote, not just admin.
The ETA for this is late tonight as I've got some things to do in-between (such as do some more tweaking to the team-talk plugin to see if I can fix some issues we've been having with it).xx