Digital BW, The Print

I have just downloaded Adobe Lightroom Beta 4.1 and have been playing 
with it.  I am told that it contains what is possibly a better tool for 
conversion of an image to black & white then the Channel Mixer I am 
currently using in CS2.  Problem is that the only conversion I see in 
Lightroom is a simple Grayscale conversion button in the Develop module 
under the Basic dropdown.  What am I missing here?

Bruce
http://BruceVarner.com