Changing of AlertManager behavior

Hi everyone!

I would like to ask you for best solution how to change default AlertManager
behavior. I would like to set all message durations to TRANSIENT for
standard info(), success(), warn() and error() calls. It's not problem
directly for my application, but I would like to change default duration
also within component libraries I'm using. Can I switch the AlertManager
implementation easily? Will it be then changed also in modules I'm uses and
my app is dependent on?

Sub-sequent question: Is there any way how to change time of TRANSIENT
durration messages disappearence?

Thanks for answer in advance!

Best regards

Ladislav