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well, someday, somehow... :)
meanwhile, you can do most of what you ask if you run the LV2 plugin in Qtractor provided you work from the generic plugin properties dialog (right-click menu, MIDI Controller...). might be similar on other LV2 hosts that feature discrete MIDI controller assignment (aka. MIDI learn) eg. notably Ardour.
on your second suggestion i think it's covered by the Feedback option when assigning a MIDI Controller... any change on the subject parameter (knob, slider, button, etc.) ends with the corresponding MIDI controller event being sent back to output (think motorized faders:))

cheers
on the stand-alone front, i am sorry, there's no means for that yet,