Workflow Actions/FlexiTask: Ability to use HTML Templates
On many workflows, we re-use most of the same verbiage and it would be helpful to have a method where we can pre-load a FlexiTask with a template and populate it with workflow variables. Right now, the only way of doing this is to click Flexi > Edit HTML > Drag to notepad, then manually drag into each Flexi. However if you click in the wrong spot once you paste the HTML in, you will get some formatting issues.

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Michel Bourdon commented
In addition to HTML templates, I suggest that the format of the mails sent in all the "user interaction" actions (mail notification, flexi task...) can inherit from an optional CSS file, defined at web application and/or site collection level.
It would avoid formatting issues that we often face with the embedded rich text editor.
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Jason Jeffas commented
To add some additional context, I would be nice to have a method to where you could save a block of HTML code as a snippet and apply that snippet inside the WUSIWUG FlexiTask editor.
Example:
<p>First name: workflowVariable$firstName<br>
Last name: workflowVariable$lastName<br>
Title: workflowVariable$Title</p>Click button or drag/drop within Flexi to set this. Similar to what you would get with a JavaScript template but you would assign Nintex workflow variables as the template variables.