HaloMods "Classic" Read-only Archive

I actually learned that all you have to do is just swap mainmenu.map's for different modded packages when you want to use different modded maps. Then just put all of your maps in a single folder.

I have an older map pack already installed, and I really enjoy some of those maps... So how do I use 2 map packs at the same time? Then how do I sign my modded maps? Thanks.