I want to use the script to change a choice parameter of an OFXEffect. But it seems that I cannot construct an OFXChoice Class, I can only use the exist OFXChoice instances and read them. The OFXChoice Class just gives the Name and the Index of it, and they are read-only. I cannot change them. If I want to create a new OFXChoiceParameter Class, the only way is to get a OFXChoice instances, but I cannot create it.