The developer only pays attention to any given “new release” thread in the Community Forums for a short while – and especially once he’s moved on to a newer version, he won’t be paying attention to the thread for an older version.
If you want better tracking, follow this FAQ to the Notepad++ Issues tracker on GitHub. You will want to search the existing issues (both open and closed) to make sure you aren’t repeating someone else’s request (I’ve seen this request multiple times).
Even posting the request there, there is no guarantee that it will be implemented to your liking: he may choose to not implement any given feature request, and might not always close issues he’s privately rejected.