So I have the following use case in mind:

• We have a large customer that uses "trusted-key"
• The customer wants to delegate checking signatures to maybe 20 people
• That list of people might change, people could be added / removed.

Currently they can either do this by adding / removing 20 trusted-keys but that is not a good solution IMO. When holding a presentation this came up when we talked about delegating trust "sub ca" like with trusted-introducer. If you could add a trusted introducer without limitations.

With GnuPG you can do that.

Please enter a domain to restrict this signature, or enter for none.

Your selection?

Kleopatra won't allow it. Maybe we can add a radio button before the domain part and have the domain entry selected by default but add another option for "anything".