Yes you can format the entire email with Policy Patrol by making use of HTML Stationery (Rules > Disclaimer rules). You can create an HTML Stationery template from Settings > Templates > <folder>. Click on New, select to create a Disclaimer template, and select Stationery template (formats the entire email). The HTML Stationary template includes two merge fields:
%New Email Body%: This field will be replaced with the most recently entered message text, i.e. the email text above the first message separator. %Previous Email Body%:This field will be replaced with the previous message text, i.e. the email text below the first message separator.
You can apply the HTML stationery by creating a disclaimer rule from Rule > Disclaimer Rules. When creating the rule, in Rule Actions select to 'Add a disclaimer/signature' to the message. Then select the option 'Add disclaimer/signature and format entire email (HTML only)' and select the HTML Stationery template you just created.