Display name of ActivityPub account is the same as username

The display name of the ActivityPub account, that can be followed on for example Mastodon, is the same as the username. This is problematic because a username has limited options of character types (e.g. no spaces). For example: If the username is named paris.events, it's difficult to find on (for example) Mastodon when searching for paris events. Using a display name like Paris Events solves this.

There is a text field in the Options tab in the admin settings named Title. I think this is used to generate a ActivityPub username. Is it an idea to use this as the display name as well (allowing spaces and capital letters)? Another idea is to add two text fields in the Federation tab where instance owners can pick their own username and display name.