If you choose to restict colour and mono printing (instead of PC control) by enabling User Code Authentication then all jobs will be flushed unless they contain a User Code in the headers that matches an entry in the address book.
PC Control doesn't really restrict who can print, you put whatever code you like in the driver and the printer creates an address book entry for it and prints! I've never seen the point of it or why it's now the default setting. Didn't know you could leave the driver code field blank either.
Try it but from memory you'll have a problem trying to work out who has printed what (think they are all logged under user = 'other'!).
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