No, there is no capability parameter that all devices have. Your application must be prepared to find a capability parameter or a possible value missing in the capability list from some devices. The Copy, Printer, Scanner, and Fax have their own jobSettingCapability to describe the acceptable (possible) values for various setting parameters.
You can set jobSettingCapability with APIs like /rws/service/copy/capability and/rws/service/printer/capability.
As the device capabilities differ from a device to another, because of the differences in hardware or installed options, the SmartSDK interface is defined to flexibly express "no possible value" by not including the value or the parameter in the capability.
For example, a device without a staple option returns the jobSettingCapability WITHOUT stapleList parameter.
The same idea applies to all capability parameters and values, including seemingly common parameters like printColorList to specify color or B&W print and tonerSaverList to specify the toner saver function.