Perhaps a checkbox in the confirmation dialog "are you sure you want to add the rca to your user" could have a checkbox like 'also add to the Local Machine store".

Applies to Fiddler Everywhere and, more importantly for me, to Fiddler Everywhere Reporter.

In my use case, I need the cert there as well to get traffic from a process that runs as a service.

As things stand, I need to (instruct non-technical end users) to export the cert and manually add it to the Local Machine store and I would rather it were simpler.