Ahoj,
in 
this post I was directed to post the issue here to give the feedback.
In the thread linked above in the OpenStreetMap forum, where this plugin is used in some categories, user interface shortcomings with this plugin are discussed.
In short there are:
This plugin forbids to post a reply to a reply. It is debateable if this should be enforced or to be configurable on a per-instance basis, but it it is enabled, the following occurs:
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The user can select some text and quote. The user can enter a reply. Only at the very end, when the reply is to be sent, it is aborted with an error message
An error occurred: You are not allowed to create a post in reply to another post.
This is a not really helpful message. It does not tell what is wrong. In fact, if a reply is not allowed, it should not have allowed “quote-reply” in the first place at all.
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When a reply is sent via email, the email just vanishes without the sender beeing informed. There should be a bounce with an explanatory message saying what is wrong.
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Only comments are allowed. But they swallow some formatting (e.g. quotes, see the comment on
this post), and also they are limited in numbers of characters, prohibiting more complex thoughts.
Regards!