Is it possible to use the 'quality' parameter of a value as a condition?
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Yes, after browsing or manually typing the $'object:aspect:property' reference, type a pound sign (#) to open a submenu from where you can select subproperties.
The IsGood/IsBad/IsUncertain subproperties return boolean value (with a purpose/use which should speak for itself) while DataQuality return the full OPC quality code where e.g. 192 signifies "good".
Refer to the OPC Foundation DA 2.0 Specification for more info on OPC qualities - an OPC server may also select to return vendor specific bit patterns giving additional info on quality.