TitleLeaf allows you to override certain channel rule settings by editing the channel.
Navigate to the Channels list (Admin > Distributions > Channels).
Go the "Edit Channel" view by clicking the channel name of the channel in question.
Expand the "Overrides" section of the form by clicking the "Channel rule (Overrides)" link.
Change the "Override Product Type", "Override Product Formats", "Override Prices" values as desired.