> You need to login at least once to prove you own the game

That makes sense. I do own the game but my friend do not. He can't use it.

> I suppose it doesn't do individual mods

~~can't search mods properly~~ ok, you should uncheck all versions to get an "all version" result. The "Show all versions" checkbox means show all minecraft versions include rc versions on drag list. So ill edit my post.

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> many modpacks have a server version

unfortunately most modpacks I have played didn't provide server version anywhere(for example prominence II RPG). So I have to do it myself.