I am sorry, but as I personally do not use the WP Comment feature, I do not want to support it any longer. The AJAX version rebuilt some WordPress stuff (reimplementing the things you extend is very bad engineering). And actually WordPress is built in a way that it does not expect someone posting comments via AJAX. A good way to do it would include having an actual implementation for the WordPress comment interfaces and exchanging them. Maybe there is another plugin that does something like this.
You seem to be the only one who uses WP Comments at all, because I only got bug reports for this from you. You should think of switching to normal WordPress comments really.
Actually I just removed the Tell-a-Friend feature for 14.12 as this feature requires a lot of manual fiddeling with the theme and I do not like the use case. One should be able to manually send a recommendation email with a link to friends. They then see that this is really coming from you and is not spam from any odd webserver. Did you check how often that feature is used on literaturcafe.de?
However as long as there are no security issues with 14.10.1 you can continue to use it. The Q&A and CAPTCHA features have issues in that version. They can be guessed programmatically.