If this is possible, is this considered good/bad practice?
It's certainly possible, yes.
As for good/bad practice, I can imagine scenarios where it would be
the most elegant (IMHO) way to accomplish something. Take class
clusters, for instance - you could extend the abstract interface
class with various -initWith... and +fooWith... methods that return
an instance of the appropriate concrete sub-type.
Apple seems quite happy to do this - AppKit, for example, adds a
plethora of -initWith... methods to NSAttributedString, and they're
declared in a category in AppKit/NSAttributedString.h.
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