There should be a way to transfer Region FX to Track FX - as there is a way to transfer clip-based fx.

And vice versa.  Today, Melodyne will not clone as a Region effect, only as a track effect - transferring it to the plugin bin would solve that.
 
Other cases will definitely arise.  

The two region effects, melodyne and vvocal, have settings that are edits of the audio in the selected region. Those edits are done after analyzing the audio in that region, and make sense only for the particular audio segment. It would cause chaos to try to transfer those settings to a track. Furthermore, those effects become much less convenient to use when they are inserted as clip or track effects. The cloning issue of Melodyne in a region is a bug, as acknowledged by CW.

I see how it would be a bit tricky, and probably require cooperation from Celemony to send the audio and timing information to the VST effect. 
 
It's just a matter of copying some audio and some data about position and so forth, but I agree it's probably too hard to get the two companies to work together enough to do it, so I can let go of it.

Cakewalk worked very closely with Celemony on implementing ARA in the first place according to all the early x3 release info so considering that Noël himself said cloning failure was due to missing code in Sonar I reckon that's as good as saying they will fix it, otherwise why acknowledge it at all. Just wonder whether it will be in x3d or later?

brian brock, looking in the Melodyne documentation to compare the track or clip (VST) operations against the ARA operations, you will get a glimpse of how the tricky stuff is handled, and maybe also see that settings on one clip or region or track would not translate at all to another. And you'll also see why ARA is much more convenient than VST.
 
Cloning should work (after fixing) because it's a special case of keeping a copy of the settings aligned with the audio for which the settings have been made. See here and here also.
 
Bill B

Sure, ARA is much better. 
 
It would be possible to transfer Melodyne to the track for which the region effect was created, just not all that easy.  As a VST, Melodyne uses time or tempo information provided through the VST interface as a kind of framework against which it plays back the audio which you've transferred in.  When you make changes, it more or less switches out the transferred audio, and instead plays back the Melodyne-modified audio.
 
As a Region effect, Melodyne still has to match audio timing information to tempo info received from the DAW.  So, to transfer it to VST, one would simply convert the Region to the "transferred audio" component of the plugin, and then take the data set about the time at which the region/transfer starts and all the edits (which is something that could, for example, be represented as an XML file if necessary), and have Melodyne VST refer to that data set.
 
Melodyne implemented under ARA is still using the VST protocol.  ARA is just an extension of VST.
 
However, while I believe it's possible to allow moving a Region effect to Track effect, as I said I really doubt that it will happen anytime soon.
 
Cloning is a different issue - I only brought it up as an example of the usefulness of the idea of moving the Region effect.
 
No need to really keep beating this dead horse.  I think I have the facts right about region effects, though maybe I'm missing something...