TIFF does single pages because it has a one page limit, usuallt there is a multi-page tiff option but that won't do what you want, it will just do what pdf does.
What you would need is something that can break up a pdf into 2 page files. I'm sure you could find some freeware that could do such a thing online.
To do it on the printer, and I am not certain this model can do it, would be to scan to email, and in that case there is a "Split-send" feature that would be able to break the job down into segments, usually by either pages, or file size. But the caveat is that it would send an email per file, which could be very hard on the mail server, if it did not automatically block the machine.
I don't have access to the device CWIS pages so I can't verify if the option is available in the email settings.