Grouping roles in Membership provider in ASP.NET

Question

I have already asked similar question before

I have basic user Roles:

-Admin
-Super User
-User

For this roles I manage site permission. Like adding new users or changing their profiles.

Also i have bunch of pages in my app, like

-Evaluation.aspx 
-Action.aspx 
-Properties.aspx

and so on. I want to be able to grant access to each page individually for each user.

I think about roles. I add User to Evaluationrole and he can browse Evaluation.aspx.

Each page in this approach has it's own role-based access model. So I will have more roles in my membership provider.

-Evaluation
-Action
-Properties

Then I can easy set page access policy in web.config.

<location path="Users.aspx">
    <system.web>
      <authorization>
        <allow roles="Admin, Super User"/>
        <deny users="*" />
      </authorization>
    </system.web>
  </location>

The problem is that aspnet_Roles in Membership provider becomes quit messy. And I have to filter roles whenever I deal with them.

For example I have List<string> with user type roles:

private readonly List<string>  UserTypeRoles = new List<string> {"Users", "Super User", "Admin"};

And when I want to bind CheckBoxList control with PagePermissionRoles I have to do smth like this:

private IEnumerable<string> UserSectionRolesGet(string userName)
{
    return Roles.GetRolesForUser(userName).Except(UserTypeRoles);
}

Is there way to create 2 type of roles: UserTypeRoles and PagePermissionRole to provide separate storage and handling.

I don't really want to override existing build-in asp.net membership provider.