It would be nice to have an option for the MultiSelect that allows us to add new custom values on blur. An input property such as [resolveOnBlur] or something similar could be added.

The idea is to type any custom value inside the MultiSelect and on blur, to select that custom value as part of selection.

The following example demonstrates how the functionality could be achieved by manually handling the input event of the MultiSelect inner input element and updating the value of the MultiSelect on blur:

https://stackblitz.com/edit/angular-5o131f?file=src%2Fapp%2Fapp.component.ts