In Case Management can we set Email as the default channel?

Are we able to set email as the default channel when using the Create Conversation SmartAction in Case Management? The Web channel can only be used in Case Management to communicate with Resources, therefore the majority of conversations will be with internal staff outside of HR HelpDesk and Case Management and external contacts so it would be useful if we can set the channel to default to Email. Please let me know if this is doable and if it is can we do it for Case Management only or is it on the Stripe?

Thanks

Shelley