Using XThreads Custom Thread Field to Hold Additional Data

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I have an idea to use XThreads Custom Thread Fields to hold additional data for a thread (I don't know how to say this correctly ).

Here is a simple example for this:
In our download forum, we will try to use a custom thread field to add "Mark This File as Downloaded" link, and hold the data of users who have marked a download thread as downloaded.

In this example, we are assuming that we already had a custom thread field with key: fupload as file uploader in our download forum.

Create Custom Thread Field:

• Title: Mark As Downloaded
• Key: dl_mad
• Applicable Forums: select our download forum
• Input Field Type: Multiline Textbox
• Editable by / Required Field?: Administrator
• Capture Tab Key: No
  

That is our custom thread field that will be used to hold the data of users who have marked a download thread as downloaded.
With the custom thread field above, Administrators has an ability to view, edit or delete the data directly in a thread (using full edit).

Put {$xt_mad_link} variable in our showthread or template_prefix_showthread template.

Screenshot:
1. If users not mark a download thread as downloaded:
   

2. If users mark a download thread as downloaded:
   

3. If users already marked a download thread as downloaded:
   

4. The data can be viewed, edited, or deleted by Administrators directly in a download thread by full editing the thread.
   

That is my idea. Not quite sure whether it is OK or not

Note:
Do Not use this plugin in a production forum. This is for example and an idea only.