Have you ever wanted to select multiple custom property values within a single custom property for a node (or application)? It simply isn't possible. There is no option for a multi-select value. You can build a list but the list is limited to a single property. This is likely caused by the schema design in which the custom property primary key is actually the value and not a unique ID. (Yech!)
Here is what we want to be able to do. When mapping a particular node to the applications that it supports (hello AppStack!) we want to be able to assign one or more values to the Supported Application custom property. While most servers have a one-to-one relationship with applications there are a few that provide data or other services to multiple applications. (Think ETL or EFT servers that may route transactions or other data to particular applications based on a set of rules) Being able to note that a node supports multiple applications in a list or belongs to multiple business units would be great.
No -- not a stopper by any stretch but I am sure once it is implemented we'll find all sorts of fun use cases for it 
