Hi Christina! That currently isn't a feature, but there was an Idea submitted that clients are voting on to make that change:   https://experienceleaguecommunities.adobe.com/t5/workfront-ideas/enhance-date-field-in-custom-form/idc-p/541559#M20252   Hope that helps!   

It would be great if there's a way to create a option to limit if issues can be duplicated multiple times. Clients run into issues when they're seeking a 1:1 ratio between an issue and a project. It causes confusing and impacts reporting when multiple projects are created from one issue.