The thing is, sys-ex is usually the kiss of death to a good tight groove. Are you sure that Karma really needs to send it?
What, off the top of your head, do you think Karma does that would need it? As I mentioned, the Korg can change Performances with simple PC# and CC#'s, so what else would it need it for?
Not trying to be awkward, just trying to get a handle on the whole thing.
Has Jay made any mention of a Karma iPad app? I would think, with the tactile surface, that is crying out for being used...
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An arranger is just a tool. What matters is what you build with it..!