I am not sure wether to consider this as a bug or a feature request, but since ACS is claimed to be somewhere in Zdoom 2 feature level I think it is safe to assume this is an oversight.
Zdoom and Zdaemon in general uses powerup inventory to tell the game that the player possesses a power (eg. he can fly). In Zdoom2, CheckInventory can be used to check for active effects (eg. the player used the ArtiFly inventory item, and he has the flying effect). Note the important part: you do not check for the existence of the "ArtiFly" inventory item (since it was already used and no longer exists), but for the "PowerFlight" powerup (http://zdoom.org/wiki/Classes:PowerFlight) which is the effect of ArtiFly.
The bug: you cannot use CheckInventory to check for active effects.
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