Thank you for taking the time to try DMC Firewall and for your review.
Within our documentation we do mention that we edit the necessary files, granted this could perhaps be clearer and we will look to make the relevant changes to the documentation as soon as we can.
The original .htaccess file is backed up and can easily be put back within a few seconds via ftp.
We are aware of an issue where multiple emails are sent out in where trigger words are detected. The issue is fixed in the upcoming release (Version 1.3).
That plugin works by scanning the site's HTML - looking for terms such as viagra, cialis, payday, loans, insurance - commonly injected into sites by the 'pharma hack' and sends an email if any of those terms are found.
Within DMC Firewall's configuration - you can increase the 'Threshold limit' so the plugin will only send you an email if x instances of those terms are found on any one page (x is user defined).
In version 1.2 and below - these trigger terms are not configurable, so if your website mentions any of those terms you would receive an email. In version 1.3+ (not released yet) they will be configurable.
We thank you for your interest in DMC Firewall and hope that you will give the new version a fresh chance when it is released.