Hi Sean,
Thanks a lot for your reply.
Indeed having the rel=canonical pointing to the wrong page would be another issue. What David Lee suggested me is using the rel=canonical on both the original post and the duplicate post. This can be set programmatically instead of the ignore button.
But surely, the ignore button would be much more easier, in some situations. Please keep us update once this ignore feature has been implement.
Thanks again for your help.
Tej Luchmun