asterisk users - May 2010 - Asterisk transfer to a conference using feature code?

Is it possible to use an Asterisk feature code to transfer a call to a
specific extension?

For instance, if you take a call, and the caller wants to go to a
conference, it would be nice to use a feature code for this, rather
than going through a longer transfer sequence.

e.g.:
- You have a meetme conference:
[conferences]
exten => 21,1,NoOp(MeetMe Conference)
exten => 21,n,MeetMe(50,pM)  ;p=prompt for pin, M=music for first caller
exten => 21,n,Hangup

- You then want to define a feature code *5 in features.conf which
will blind transfer the caller to (conferences,21,1)

Any suggestions/examples as to how to set this up?

Thanks