If there are any Reaper users here, you may be interested to learn that a user has made a pretty comprehensive sysex editor using Reaper's JS scripting language: http://forum.cockos.com/showthread.php?t=170285
Come to think of it, since ReaPlugs is available as a free VST for use in other DAWs (Windows Only), it might be of interest to others. I've been testing it today with Bob's 2.14 OS, and so far, so good!
I will probably get around soon to modifying this editor to take advantage of the new sysex modes added to the 2.14 OS so that I can edit negative values without having to do bulk dumps.
Man, if it were possible to edit the mod matrix in the 6/R via MIDI, it would make these synths that much more viable in a modern production environment, given the new tools available.