(1) AO is only active on frontend (anonymous or logged in), never on backend. the api-filter would allow you to disable AO when there's "fl_builder" in the URL (see the example mentioned above, you'd just have to change "no-autoptimize-now" to "fl_builder")
(4) you could even add "text/html" (without quotes) to the JS exclusion list immediately
If you want you can test-drive 1.9.3 by downloading the zip-file from Autoptimize's Github repository.
frank