Looking at the timouts suggested in Comment #15, I think they may actually be 
realizable with modular scripts. A base rootdelay script, and separate mdadm 
and cryptsetup sripts (that get called by their udev rules) can halt/extend the 
regular rootdelay (exported variable? named pipe?), if waiting for user input 
or a new level of raid degrading timeout. (As pipes block, reading from pipes 
may do good for event based processing.)

Phillip, your idea of handling udev events by modular event handlers (that may 
again trigger udev events, if I interpret you correctly) may also be what 
appears in part of the OpenRC discussion.
On init in Debian http://lists.debian.org/debian-devel/2012/03/msg00452.html
RFC: OpenRC as Init http://lists.debian.org/debian-devel/2012/04/msg00547.html

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https://bugs.launchpad.net/bugs/251164

Title:
  boot impossible due to missing initramfs failure hook / event driven
  initramfs

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