Depends on if you ever wanna custom tune it or not. For stock engines with a few bolt ons (air intake, exhaust), Superchips is the best all around tuner, you'll be able to turn MDS off with it plus gives you the option of trans tuning. You can do the same thing with Diablosport for MDS; it doesn't support trans tuning by the user but it does allow for custom tunes (larger mods) and the trans can be tuned through CMR tuning.
If you drove it around with the MDS harness unhooked you'd get codes, but it wouldn't affect normal operation (default mode for MDS is off, it would just **** the PCM off, hence the codes), especially since the harness wouldn't have anywhere to go.
If you drove it around with the MDS harness unhooked you'd get codes, but it wouldn't affect normal operation (default mode for MDS is off, it would just **** the PCM off, hence the codes), especially since the harness wouldn't have anywhere to go.