Seems a bit feeble.
I'm thinking of writing a script, in that case. Select an object. Run
the script. Select an object style from the list the script gives you.
Click OK (or Done). Now all objects that have the selected style applied
will have the object export options of the selected object applied to them.
What do you think?
It's not uncommon. The InDesign team had a lot of work for themselves in CS5.5 and CS6 to provide better support for EPUB export. They made a lot of progress, there's a lot more yet to be done.
That's usually the way it with new features. Almost never will a new feature be complete on release. There are just too many other competing constituencies to please. And there are not an unlimited amount of engineer and QA hours avaiable.