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System Settings/Advanced tab/Device Actions allows some configuration of actions associated with various kinds of device. The selection criteria for each action specifies the values for certain fields for the device, but there's no list of valid values. The user has to guess at a value and if he gets it wrong the dialogue simply says the value is illegal. Since there's no online help for this, there is a usability issue which should be fixed.

Suggestion: use a drop-down list of legal values for fields which have them. Failing that, document the legal values, or tell the user where the values come from so he can consult another source.