We offer support for Yaffs through the Yaffs mailing list. It's best to start by searching the list archive to see if someone has already asked the same question.
If you feel uncomfortable asking your question on an open mailing list you can try mailing us, but we (or you) may say 'You should be paying for this' .
Serious long-term work is best done as a negotiated contract; for instance we have built special features for clients with very particular needs. If you think you may want this sort of help then contact us, telling us a bit about your problem.