Sorry, but I don't think there IS such a midi command. In the terms that you seem to be suggesting.
You can apply global midi commands to chance Tempo, Time Signature, Key, but not tuning.
Many of the devices (keyboards, modules, etc) that allow the precise sound/patch to be edited, include a parameter for tuning or transpose, which will affect that specific sound ONLY. Such a modification may well be appropriate to that sound. A global adjustment however could well be trying to change instruments/sounds for which it is NOT appropriate.
Furthermore, midi works because note number ## is defined as being note ff (frequency). If you adjust the global tuning of the device, and then play a midi file, the sound could now be wrong?
Geoff