If you are using SharePoint Designer to add the RadHtmlField controls to the page layout, you can specify the ToolsFile property of the control directly from SP Designer and choose a custom tools file. See http://www.telerik.com/help/aspnet-ajax/setting-config-tools-files-in-wcm.html
for more information.
Unfortunately, if you are not using SharePoint Designer and the editor fields are activated using the site features page, then there is no way to have different configurations for the editors on the page.
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