Kyocera ECOSYS P5021cdn driver

Which would be the recommended Gutenprint driver for a Kyocera ECOSYS 
P5021cdn?

I recently purchased this printer and installed the ppd provided by the 
manufacturer. It prints great, but I miss some extra stuff. In the CUPS 
menu I find a Booklet/Folding option, but it does nothing. Looking into 
the PPD, I find that this option is empty.

I tried a Gutenprint driver (I don't remember exactly which), and it 
works, although the printing is not that good.

Do you know of any general Gutenprint driver including the Booklet 
option that can maybe work here?

Having more choices in terms of resolution so that I could save toner by 
reducing it would also be nice?

Thanks for your help.