Restrict color printing and apply different quotas to color/B&W printer

Hello,

I've been reading in mailing list files some posts about the subject
but they was mainly old and not enought clear messages (to me).

It is possible to restrict color printing (to some users) and apply
different quotas (color and B&W quotas) to the same printer?

If it is explained in other posts or in any docs (that I'm not able to
find), could anybody send that links to me, please?

(I'm reading about ink accounting, ink coverage,... but I've not
understood what I must to do or how I can configure PyKota...)

Thanks in advance,
Daniel.