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You're on UNIX, yes? A symbolic link would do the job then. If you're on 
Windows, sorry, there's no real easy solution since the detectors 
directory currently has to be in the tracker home dir. It forms part of 
the "code" of the tracker home. A hack workaround would be to 
modify the detectors __init__ in both so it imported the detectors 
from a common place and included them manually...