First time I'm hearing about this. Guess a few questions would come up, assuming that that are getting set to inactive in the tag based on their record status (have not confirmed this yet).
First, would you want an inactive record to be able to register for events or groups and remain inactive? Right now when you mark a record inactive, it automatically sets them to inactive in all tags and groups (after warning the user of such changes).
Second, if you do allow them to sign up, should that record remain inactive, or get switched to active status? I could see this causing some issues since a record status might have been set to inactive for a reason, and I can see many organizations wanting to deal with that status change manually as additional actions might need to be taken at that time.
I'm sure there's a ton of other potential areas that need to be considered as well, just the two major ones that stand out off the top of my head.