Workflow Signer Dropdown

Please make it so, as an Adobe Administratior, I can create a dropdown list of acceptable signers in a workflow. Currently a workflow either allows an email to be entered by the admin while creating a workflow, or it can be left blank to allow the user to fill it in while sending a workflow. We have multiple use cases in our organization where a user needs to send a workflow to someone, but depending on where they are at in our orgainzation that someone is different. Many times they do not know who this individual is, so we end up putting a list of acceptable signers in the instructions (Which are easily skiped over by the way, please make them more pronounced.) and then next to the title of the signer "Budget Officer" I put a note to direct them how to figure out who their budget officer is; (Click blue “More” button to see list of appropriate signers). It would be great if instead they could click on the line where they would typically enter a signers email, and see a list of people they can select from.