Loading screen is not that big of a deal, but they'd only see it after the mod has been previously installed anyways so it wouldn't be visible if they're downloading and installing it.

Somehow the minimap is missing at the loading screen.Is there any way to fix that?

just subcrobe to this mod and add { "map":"ns2_docking_classic", "mods":["925bc73"]} to your mapcyle, so players only hav eto download the mod if its really needed (in case they vote dfor it) :)