Hi,
this bothers me also.
I tried to select few labels (for diff model objects in "Object presentation", it allows me to select them, they are all marked, but when I change the label - just the one I selected is changed, not all the selected.
In Model broeser when you want to change some properties for multiple parts, when I select multiple parts and chenge the properties at one of selected, all of them receives the new values...
Cheers,
Nenad