Handlers in LWP::UserAgent subclasses

Is it considered acceptable for a subclass of LWP::UserAgent to invent
a new phase name, and process handlers for that phase in new and/or
overridden methods?  If so, are there any naming recommendations that
are likely to avoid conflicts with phases added in future versions of
LWP::UA?  And is the run_handlers method available to subclasses for
these purposes (despite not being documented at the moment)?

I'd be happy to submit a documentation patch with the answers to these
questions, once I know them. :-)

-- 
Aaron Crane ** http://aaroncrane.co.uk/