Things EntityFramework 6's DbModelBuilder is missing or could be more succinct.

DbModelBuilderExtensions.cs

/// <summary>
///     Things <see cref="DbModelBuilder"/> is missing or could be more succinct.
/// </summary>
public static class DbModelBuilderExtensions {
    /// <summary>
    ///     Configures the primary key property for this entity type.
    /// </summary>
    /// <typeparam name="TEntityType"></typeparam>
    /// <typeparam name="TKey">The type of the key.</typeparam>
    /// <param name="keyExpression">A lambda expression representing the property to be configured.</param>
    /// <param name="databaseGeneratedOption">
    ///     The pattern used to generate values for the property in the database. Setting
    ///     'null' will cause the default option to be used, which may be 'None', 'Identity',
    ///     or 'Computed' depending on the type of the property, its semantics in the model
    ///     (e.g. primary keys are treated differently), and which set of conventions are
    ///     being used.
    /// </param>
    public static EntityTypeConfiguration<TEntityType> HasKey<TEntityType, TKey>(
        this EntityTypeConfiguration<TEntityType> config,
        Expression<Func<TEntityType, TKey>> keyExpression,
        DatabaseGeneratedOption databaseGeneratedOption
    )
        where TEntityType : class
        where TKey : struct
    {
        config.HasKey(keyExpression);
        config.Property(keyExpression).HasDatabaseGeneratedOption(databaseGeneratedOption);

        return config;
    }

    /// <summary>
    ///     Registers an entity type as part of the model and calls a callback to configure the entity.
    /// </summary>
    /// <param name="config">The configuration action.</param>
    public static void Entity<TEntityType>(this DbModelBuilder builder, Action<EntityTypeConfiguration<TEntityType>> config) where TEntityType : class {
        config(builder.Entity<TEntityType>());
    }
}