Can you please clarify which is the exact feature that we're discussing here, so I can be sure we're on the same page. Since Sitefinity 4.1 we have introduced backedn configurations for the HtmlField, which allows you to set certain properties from the backend configurations (for example ToolsFile) without the need of mapping the template and creating different editor configurations. For more information about this functionality, please take a look at this blog post.
The option of setting custom editor configurations is still available in the latest official release of Sitefinity (4.3) and will allow you to create and use custom ToolsFile configurations Please do not hesitate to let me know if the functionality you demanded differs from what I've described above.
the Telerik team
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