No inertial scrolling.
The nightly I'm using has it.
One window per instance, no tabs.
The betas have had tabs for a long time. They're in the left toolbar.
Package is not "optified" - it installs to the device root instead of /opt
Fixed 3 weeks ago
Currently there are only three add-ons not marked "experimental"
I myself have written five add-ons for Mobile that are out of the sandbox, so I don't know where you're getting your numbers.
even in experimental there's no AdBlock Plus
Support added 2 weeks ago
It sounds like you haven't tried Fennec since the early betas. Might be time to give it another shot.