New conditional action: active automations

In automations, could you add a new conditional action to select which automation should or should not be active? Just like there is a condition for included tags.

I need this because I have 2 similar automations and I want to avoid them running at the same time for single person. So I want to check if they already have an active automation and if yes, the second automation stops.

Also, is it possible for people to opt-out of email automations? In the bottom of the email, they can click "Manage preferences" and from there, they can remove from lists, but not automations. So currently they can't stop the automation (sales letters for a specific product for example).

Thanks!