customize the Service defaults for (just) some of the message type's?

[iirving]

Is it possible to override the Service defaults for (just) some of the message type's?

what I would like to do is for type's [warning', 'danger', 'alert'] to set a much longer timeout and/or make them sticky, and do so globally in the config/environment.js, rather than on a message by message basis.

[sbatson5]

You may be able to reopen the flash object and override timeout to be conditional. There are some examples of reopening objects on the Ember guides website:
https://guides.emberjs.com/v2.10.0/object-model/reopening-classes-and-instances/