Need help with Ogg Vorbis -q settings

I am using Debian 3.1r0a.  In Grip I have noticed that selecting oggenc 
encoder gives a command line output of:

-o %m -a %a -l %d -t %n -d %y -G %g -b %b %w

However the -b bit rate setting in Vorbis is no longer prefered and -q 
for quality level is now in use.  I would like to know why -b is used 
instead of -q.  I myself would like to use -q with a setting of 5 or 6. 
  How can I set up Grip to tell oggenc -q (level)?

-o %m -a %a -l %d -t %n -d %y -G %g    (Example [-q 5])   %b %w
Correct.. no?


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