Is there a way to create a custom User and Role without specifying the TKey on IdenitityUser, IdentityRole, and IdentityDbContext?

Is there a way to create a custom User and Role without specifying the TKey string in IdentityUser, IdentityRole, and IdentityDbContext? I ask because it seems to think I don't want the auto-generated primary key Id anymore and I absolutely do. Doing what I've done below, UserManager.Create(user, password) will fail with an EntityValidationError on Id.

public class ApplicationUser : IdentityUser<string, ApplicationUserLogin, ApplicationUserRole, ApplicationUserClaim>
{
    [Required]
    [StringLength(50)]
    public string FirstName { get; set; }

    [Required]
    [StringLength(50)]
    public string LastName { get; set; }
}

public class ApplicationUserLogin : IdentityUserLogin
{
}

public class ApplicationUserClaim : IdentityUserClaim
{
}

public class ApplicationUserRole : IdentityUserRole
{
}

public class ApplicationRole : IdentityRole<string, ApplicationUserRole>
{
    [Required]
    [StringLength(50)]
    public string ProperName { get; set; }

    [Required]
    public string Description { get; set; }
}


public class MyAppDb : IdentityDbContext<ApplicationUser, ApplicationRole, string, ApplicationUserLogin, ApplicationUserRole, ApplicationUserClaim>
{
    public MyAppDb()
        : base("MyAppDb")
    {
    }

    public static MyAppDb Create()
    {
        return new MyAppDb();
    }
}

It appears the answer is "NO". If you specify the TKey on User and/or Role the primary keys are no longer created for you.

It seems I was trying to over-complicate things. Thanks @dima for helping me decide to un-complicate things. Here is what I did to successfully get users and roles (both with custom properties) to successfully work, i.e., to successfully create records in the database via a controller and view:

UPDATE: You may want to look at the link I provided at the bottom for a better/simpler solution.

public class ApplicationUser : IdentityUser
{
    [Required]
    [StringLength(50)]
    public string FirstName { get; set; }

    [Required]
    [StringLength(50)]
    public string LastName { get; set; }
}

//public class ApplicationUserLogin : IdentityUserLogin
//{
//}

//public class ApplicationUserClaim : IdentityUserClaim
//{
//}

//public class ApplicationUserRole : IdentityUserRole
//{
//}

public class ApplicationRole : IdentityRole
{
    [Required]
    [StringLength(50)]
    public string ProperName { get; set; }
}


public class MyAppDb : IdentityDbContext<ApplicationUser, ApplicationRole, string, IdentityUserLogin, IdentityUserRole, IdentityUserClaim>
{
    public MyAppDb()
        : base("MyAppDb")
    {
    }
}

However, a new issue has arose with the UserManager. Specifically, I'm getting the error The entity type IdentityRole is not part of the model for the current context. on this line of code var identity = await UserManager.CreateIdentityAsync(user, DefaultAuthenticationTypes.ApplicationCookie);

UPDATE: Fixed this error here: Why am I getting an IdentityRole error?