I had the same problem, here was my solution (kind of a work around):
I download one of the many web pages that has a listing of all the bash linux command line apps. like this one:
http://www.ss64.com/bash/ ( I think this is what i used) Use wget or something to download the index and all the links for the specific commands.
Then I put it all in one openoffice.org text document (arrange to your liking), and save to a PDF file.
Then use one of the PDF viewers and the search function. works great. and probably takes up less space than the actual man pages take up.
as to the rest of the missing commands on the Z, I installed busybox?? package I think, and it added all I needed.
I also did the same with the Perl documentation.
later