I'd like to be able to include, for example, bootstrap as a theme to my Web Form Project.
Would it be possible to have a Project wide setting where you either add the .css and .js files as resources then link to them using
<link rel="stylesheet" type="text/css" href="theme.css">
<script src="myscripts.js"></script>
Or have a place to add scripts and styles with a list of URLs and these be added to the <head> (or footer for js) to every Form.
With 
CSS3 and 
HTML5 there are a lot of new feature rich things that the Theme Editor doesn't support in the GUI.
We can't add border-radius or animation properties.
There are various articles from Andrew that show you can make your Workflow look awesome but there is a lot of work involved using the IncludeHTML.
One idea I had was to create a Theme, then add a Template. Within the Template add an IncludeHTML which contained the links to the CSS and JS then add that Template to each Form but seems a bit cumbersome. Why not have an extra tab in the Properties to take care of this.
Links
Concepts Primer – Applying Custom CSS to Workflow Forms
Theme Builder
- https://www-secure.symantec.com/connect/articles/creating-workflow-themes
- (":\Program Files\Symantec\Workflow\Designer\bin\LogicBase.Composer.ThemeEditor.exe")
Convert a CSS file to an xTheme
Add a Custom Font
Modify DOCTYPE