Can I create a custom table with a foreign key to "umbracoUsers"? And if so how do I decorate the model for the user Id? I created a hack that works for reading the information and presentation but when I try to save my new record I'm failing hard.

    private DatabaseContext dbc = ApplicationContext.Current.DatabaseContext;

        private umbUser _creator;
        private umbUser _modifier;

        public Features()
        {
        }

        [PrimaryKeyColumn(AutoIncrement = true)]
        public int id { get; set; }
[Column("modified_by")]
        public int modified_by { get; set; } // int

        [Column("created_by")]
        public int created_by { get; set; } // int
 // [ForeignKey(typeof(Umbraco.Core.Models.Membership.User), Name = "FK_nftaFeatures_umbracoUser_created", Column = "id")]
        public umbUser creator {
            get {
                if (created_by >= 0)
                {
                    var qry = new Sql().Select("*").From(dbc.SqlSyntax.GetQuotedTableName("umbracoUser")).Where<umbUser>(x => x.id == created_by, dbc.SqlSyntax);
                    _creator = dbc.Database.FirstOrDefault<umbUser>(qry);

                    return _creator;
                }

                return _creator;
            }
            set {
                if(created_by >= 0)
                {
                    var qry = new Sql().Select("*").From(dbc.SqlSyntax.GetQuotedTableName("umbracoUser")).Where<umbUser>(x => x.id == created_by, dbc.SqlSyntax);
                    _creator = dbc.Database.FirstOrDefault<umbUser>(qry);
                }
            }
        }

        // [ForeignKey(typeof(Umbraco.Core.Models.Membership.User), Name = "FK_nftaFeatures_umbracoUser_modified", Column = "id")]
        public umbUser modifier
        {
            get
            {
                if (created_by >= 0)
                {
                    var qry = new Sql().Select("*").From(dbc.SqlSyntax.GetQuotedTableName("umbracoUser")).Where<umbUser>(x => x.id == modified_by, dbc.SqlSyntax);
                    _modifier = dbc.Database.FirstOrDefault<umbUser>(qry);

                    return _modifier;
                }

                return _modifier;
            }
            set
            {
                if (created_by >= 0)
                {
                    var qry = new Sql().Select("*").From(dbc.SqlSyntax.GetQuotedTableName("umbracoUser")).Where<umbUser>(x => x.id == modified_by, dbc.SqlSyntax);
                    _modifier = dbc.Database.FirstOrDefault<umbUser>(qry);
                }
            }
        }
}


    [TableName("umbracoUser")]
        public class umbUser {
            public int id { get; set; } // id int Unchecked
            public string userName { get; set; } //  nvarchar(255)   Unchecked
            public string userLogin { get; set; } //    nvarchar(125)   Unchecked
            public string userEmail { get; set; } //    nvarchar(255)   Unchecked
            public string userLanguage { get; set; } //     nvarchar(10)    Checked
        }

bump...