The ability to include/exclude custom sources in bulk in the same way as classic sources would be useful if capability is possible. 

Secondary to an ability to bulk include/exclude custom sources would be the ability to bulk edit custom source profiles, basic authentication, SSL validation, and location.  I also noticed when editing custom source that I had to update in phases. I imported csv of devices.  I then attempted to update the profile and auth and location but it stated the source already existed and when I exited it only saved one of the settings. I then edited the src again and updated the location. If I recall it was unable to edit the tags at the same time as other config fields as well. No big deal for the few devices in my workspace and I have finished update but wanted to bring to your attention.