What are the recommended ways to create bundles of software for a nixos config so you only have to select a single option to install and configure multiple related packages?

If it's only for your self I would write a nix module that does everything you need, then import the module in the system configuration. If you want to enable/disable it all you need is to add/remove one line in the imports section.

I'm a fan of putting factored expressions into their own files and importing those files as NixOS modules. For example, let's say that we want to install vim. We might start with a vim.nix:

        { pkgs, ... }: {
      environment.systemPackages = [ pkgs.vim ];
    }


  

Then in the main configuration, this can be imported by path:

        {
        imports = [ ./vim.nix ];
    }


  

Adding the import is like enabling the feature, but without any options or config. Later on, the feature can be customized without changing the import-oriented usage pattern:

        { pkgs, ... }:
    let
      vim = ...;
    in {
      environment.systemPackages = [ vim ];
    }


  

Since the imported file is a complete NixOS module, it can carry other configuration. Here's a real example, adb.nix, which adds Android debugger support:

        { pkgs, ... }: {
      programs.adb.enable = true;
      environment.systemPackages = [ pkgs.pmount ];
      users.users.corbin.extraGroups = [ "adbusers" ];
    }
  

Write a NixOS module, publish it in a flake in the nixosModules output, import that flake in your flake-based NixOS configs.