I had to do some nasty tricks, like delete a lot of animations or frames for the development process, then import them again when I needed to export, if you have a lot of audio file, that would be much easier to remove and add later, some new big features I would make in a separated capx and when it's finished I would marge it.
Basically my conclusion was (this goes for mostly big projects), don't import a lot of asset before you got most of the code done, use mostly 1 frame to set up pose preview, animations names, collision, hot-spots and related code.
An option to import animations from another object (with all settings) would have make this much easier to maintain, you could have a capx that holds the full object, then you can drop it as a new one and transfer all the animation, unfortunately there is no built in option for this, you can do it by manually editing the caproj file and replacing the object.