Unfortunately there is no direct way. You could create a new template, register your user control on the top of the template and then insert the tags that use this control in the body of the template.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items