We're just getting used to Fogbugz and emailing other people within a case seems like a good way to comment on something to someone (other than the assigned-to person in the case) or a group of people except for one thing. It's all too easy to click on the "Send & Close" button by mistake. We've already had a few cases that are closed by mistake when trying to do an email action within a case.
It would be nice to be able to configure whether to show this button or not on a category basis. For example it makes sense (for us at least) to enable this for Inquiries but not for the other types of cases.
Along the same lines it would be nice to also configure whether the Reply action assigns the case to you or not per category. Again this seems to be something good for Inquiries but not necessarily so for bugs/features.