specify amount of emails to send out per day in a sequence or workflow

Our sales team work with large, segmented contact lists and a lot of the time we look to enrol contacts into a sequence via a workflow. Workflows at the moment only allow us to split by percentages, which can be time consuming to apply if the lists are large and you only want a certain amount to go out per day. It would be good if there was a way to set X amount of email sends per day on the branches, as well as the percentage options.