Cutom property for a User Task

I am not aware of a way to add task properties globally.
Can you just add pv's to your models to track and dynamically apply your business rules? The pvs would be available in the in memory reports and you could also persist the values to the DB.

In addition to Christine comments we cannot make the changes to the task properties as those are predefined, for displaying it in the reports we can use either by a!queryprocessanalytics or fetch the data from database using a!queryentity and display them accordingly.