Currently, child objects get default wrap options, which essentially means "expose everything". Perhaps it were more reasonable if wrapped children inherited the options from the parent, or at least there could be a wrap option to make this possible.
Alternatively, Qt Script could look for a "magic" metamethod, e.g. qscript_wrapoptions, in the parent object, and call this function to query wrap options for an object of a given name; this would allow full control of wrap options per child.