For backend, I don't think they have that capability built in, because I think relieving the developer of that hassle is one of the reasons to use an mBaas, you can probably add that in yourself though. I'm new to most web development/app development so I'm not 100 on that.
Not to throw apigee on the bus, but if you need custom backend control,feedHenry, another mBaas, does a decent job on allowing the developer to write a custom backend if they want too. They are free too, but the documentation is really outdated and support is lacking, along with the forums, but if you really wanted to make it work you can, some of their cloud api docs are outdated, but they still work if you realize what they updated.
Apigee is a lot easier to work with though, with the direct calls to the backend.
Not sure about the rest though.
Hope that helps somewhat, if at all.