The creation of a User or Device Collections for each Application, whose members are devices/users of deployed PatchMyPC of each respective supported application through use of a Query Membership Rule, would be useful so Automatic Deployment Rules can target them specifically and for use by other SCCM features that utilise collections.
I just came to add this as a new idea. Glad I decided to search first and found this one. This would be a great feature of when adding in a new application that it creates a device collection based off of the number of installs for that application.
This would be a great feature to help speed things up