Customized Tridion Search Index Handler: Custom vs Standard field for page url?

I was playing around with custom Search Indexing Handlers for SDL Tridion 2011 (GA). I got something working, using the very helpful information provided by Arjen, however I am not sure if my execution is the best option.

The requirement is to be able to search for pages in the CMS by url (eg www.example.com/news/index.html). In order to do this I have the created a class using the ISearchIndexingHandler interface (code below). I am indexing the url in the ContentText field of the item, however I am not sure if this would normally contain something else for a page (I think a page only has metadata so this should be OK). The advantage of using this over a custom field is that I can simply type the url in the search box without having to use <url> IN <fieldname> or something like that.

So my question is, is there any reason not to use ContentText for Pages, and is there any advantage in using a custom field? Also bonus marks go to anyone with good ideas on how to handle BluePrinting (if I create a page in a parent publication, I want the local urls also to be indexed in the child publications), and the case where a Structure group path is altered (I guess I can somehow trigger a re-index of child page items from within my indexing handler).

The code:

using System;
using Tridion.ContentManager.Search;
using Tridion.ContentManager.Search.Indexing.Handling;
using Tridion.ContentManager.Search.Indexing.Service;
using Tridion.ContentManager.Search.Indexing;
using Tridion.ContentManager.Search.Fields;

namespace ExampleSearchIndexHandler
{
    public class PageUrlHandler : ISearchIndexingHandler
    {
        public void Configure(SearchIndexingHandlerSettings settings)
        {               
        }

        public void ExtractIndexFields(IdentifiableObjectData subjectData, Item item, CoreServiceProxy serviceProxy)
        {
            PageData data = subjectData as PageData;
            if (data != null)
            {
                PublishLocationInfo info = data.LocationInfo as PublishLocationInfo;
                string url = GetUrlPrefix(data) + info.PublishLocationUrl;
                item.ContentText = url;
            }
        }

        private string GetUrlPrefix(PageData page)
        {
            //hardcoded for now, but will be read from publication metadata
            return "www.example.com";
        }
    }
}