Here are some partial answers. Others are still under investigation.

wgbrass apparently has an undocumnted k-rate argument before iatt.
Documentation should be updated before too long.

The argument knum in shaker opcode was eliminated in Csound vers. 3.49, but
I negelcted to remove it form the pdf manual until vers. 3.51. Current pdf
manual has it right.

Sorry for the confusion.

-David. 

Andre Bartetzki wrote:
> Does that mean that there is an undocumented argument before 
> ifn, for example
> an idetk-time similar to the other wg opcodes?
-snip-
> -----------
> 5. ar shaker kamp,kfreq,kbeans,kdamp,knum,ktimes [,idecay]
> 
> A line similar to the example given in the manual results in
> 
> error:  too many input args, line 13:
> a1  shaker  20000, 400,8, 0.999, 0,100,0
> 1 syntax errors in orchestra.  compilation invalid
> 
> (see also Javier Ruiz' message some weeks ago)