Forums is not Generic Content base module. You can set external templates if you create a custom provider
that inherits from Telerik.Forums. ForumProvider and replace the default one.
Inside the provider you can override the public properties like
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items