it looks like this is now possible with ReaConsole in the updated SWS extension, see his post here:
http://forum.cockos.com/showpost.php...3&postcount=50
So to get this working, you'll need
-A virtual midi port driver (Maple or MidiOX, both free)
-A midi plugin that can remap just the note offs (Piz VST midi plugin pack, also free))
-The latest SWS extension.
I can go into more detail if you like, but I saw over on TapeOp that you were probably taking the ADAT out of the chain, so I'm not sure this makes sense for you anymore.