Workspace: select allocation type

[#1]

It would be nice to be able to select metric allocation in Workspace instead of having to create a calculated metric. An option like in Ad-hoc or adding it to the gear/options menu for a metric would be useful. 

Reference: https://marketing.adobe.com/resources/help/en_US/reference/reports_pages.html

[#2]

Thanks for the feedback. This one is on our radar, we are discussing the right time & way to bring in this functionality given some other initiatives underway.