OK I can't believe this can't be found anywhere so I'm asking the question.
Is there a way to set the default Html Editor Profile in Sitecore so I don't have the override the Source field on each individual Rich Text field?
e.g. I want to make this the default option for the Html editor:
/sitecore/system/Settings/Html Editor Profiles/Rich Text Medium
Its an old question but here is the solution I found in Sitecore 6.5 - I was looking to do the same thing in 6.5:
You can change the value to the path of your default editor in the web.config. This will change is across all fields where the source is not defined.
<!-- HTML EDITOR DEFAULT PROFILE
Path to the default html editor profile.
Default value: /sitecore/system/Settings/Html Editor Profiles/Rich Text Default
-->
<setting name="HtmlEditor.DefaultProfile" value="/sitecore/system/Settings/Html Editor Profiles/Rich Text Default"/>