How can we set Leanplum configuration before setup?

[bart-kneepkens]

Leanplum's SDK exposes some configuration properties that need to be set before start() is called; for example to use 'Custom Delivery Deferral':

Leanplum.deferMessagesForViewControllers([HomeViewController.self])
Leanplum.start()

Since with this SDK we don't call Leanplum.start() ourselves, would it still work to use deferMessagesForViewControllers on the Leanplum SDK directly?