Is it possible to set/publish more than one security/damage deposit? I would charge a much smaller amount for short stays, but wish to charge a greater amount for a long stay, such as a week or month.
No, there is no way of doing this on the Airbnb system. If you are doing a long term stay, Airbnb recommends you have a rental agreement and I would charge an additional security deposit which I would collect before releasing keys.