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The reason that everyone goes to the "To" line for a bulk email is so that each email will be sent with individual personalization. If you are not personalizing an email, then you can select Send Email via the quick actions button, and then add as many users as you want in the BCC line. Please note when doing this that they will all receive an identical email, meaning it will not be personalized with the names of people who are in BCC.

In order to schedule emails, if you click the cell in the Next Actions column for their prospect, you can "Add Task For This Prospect", which you can then configure to be an automatically executed Send Email action. After saving, you should see the task in the Prospect's task list with a "One Off" tag next to it.