Hey there,
After scrolling through the comments and being suggested by the author, I feel like a lot of people would like to see this addon be able to be used in other gamemodes. I don't have a lot of experience with any gamemodes other than TTT, but I'd assume others aren't much different. In TTT, all that would have to happen is that when the player spawns, the loadout is applied. As for the menu, you should be able to have it in a tab in something such as ULX, or you could have a command that opened up a window you created yourself. I'm not sure if there's documentation on the ULX suggestion, but if you want I could do some looking. If there's any part of this addon I'm overlooking please mention it so that we can discuss ideas for it. I haven't actually used the addon, because I don't play sandbox, I play TTT and would like to see this on my server.

Thanks for your understanding,
Chief