I use a Ricoh MPC 5000 with Fiery. After installing 10.6, I too lost fiery controls (seems to be a common problem on these threads). There used to be print dialog option for "fiery features", which would allow me to control duplex, staple, booklet printing, etc).
Something that has worked for me (I am not a tech, so bare with me...):
1) Install the printer (I did it via the IP address usually a 172.something rather). For the Queue option, type in "hold" (without quotes, make sure lower case).
This will send you print to the hold instead of directly printing. If you leave blank or type in "print", you will not get Fiery features, but will be able to print directly).
2) If you don't have it already, download/install "Command Work Station", Mac edition (CWS). For me, I had to download it (for free) from Ricoh's website. It was a package called "efi_utilities.zip" (
http://www.ricoh-usa.com/downloads/EFI_Utilities.zip ).
A disk that came with the printer should also have the software, as well.
3) When you print (to the hold Queue), Open up CWS. For first time use, enter in the IP address to get to the printer. You may have also get a log in screen. Clicking on Operator and login (leaving password blank) worked perfectly for me-but you may have to enter something (check with IT, if you have internal support that may have created a password).
4) you should now see your job in the "Active jobs" (you can also see all of the other jobs that have been printed already).
Viola!
Double clicking your job will now now give you full control (same as the "fiery features" did before, but better*). Cleick layout for booklet, duplex, etc... you get the idea.
*Even though this method seems a bit of a pain, it actually works better. For example, if you (assuming you could) printed a pdf x 50 via the "fiery features" option, the job actually gets sent FIFTY times (so does all the job output options). With this way, when you hit print x50, the information is already on the fiery, so it does not need to resend every print. You can also keep the job there, if it is something that you print frequently. It's annoying to open CWS every time, but it's a great work around, and actually has better options for complex jobs.
Good luck!