The CLT for createcontext and changecontext contain dynamic attribute setters. A dynamic attribute consists of a namespace, a name and a value. Attributes have to be specified in the form --namespace/name=value or, for removal --remove-namespace/name. For example:

createcontext -i [someid] -A ... -P ... ... --com.openexchange.some.feature/someAttr=someValue

or

createcontext -i [someid] -A ... -P ... ... --remove-com.openexchange.some.feature/someAttr