Solution
VeriStand Screens are built on the Windows Presentation Foundation (WPF) Framework. It is possible to create your own WPF controls and indicators and add them to the VeriStand environment. You can refer to the VeriStand Editor Plugin Examples repository in Github for more information.
That being said, the process of creating a control from scratch is not simple, and is not recommended unless the programmer has existing experience with C# and WPF.
Another option for VeriStand developers wanting more extensive UI elements is to build the user interface in another tool, such as LabVIEW, C#, or another language that supports .NET programming, and then interact with the VeriStand system using the VeriStand .NET APIs.