Full measure rest positioning

[Mark Dewey]

I've been trying to figure out how to either manually position full measure 
rests, or to have them all go in a certain position.  I'm using 3/4 time.

With normal rests, I can do b'2.\rest or put \override Rest #'direction = #'0 
in the code above.

I can do R2. but the position is too high, due to how I've got the voices set 
up.

How might one do this?

Anyway, just a musical question:
Is it wrong to just use r2. instead of a full measure rest?  In my case, this 
is the first measure of the piece.

Thank you for the help.