Thanks. We've heard this suggestion before, but never here on the Q&A site. The most similar is this one.
It's a great idea, and not as difficult as, say, a port to Android. We'll definitely consider it. However, while we'll be deep in MD development for the next 3-6 months, this feature isn't like to happen in that period.
One thing that will get your MIDI Designer more integrated on your OSX machine is to use Music IO for the connections (as opposed to, say, Wi-Fi). A direct USB connection for MIDI is a lot more straightforward, in our experience (and we're co-authors on the project, too).
Thanks for digging and using MD!