MarkT:
The devices already have fast recovery diodes built in as its a MOSFET half bridge surely? You might want to augment with power shottky rectifiers to reduce freewheel losses though. Transient suppression diode(s) and decoupling can all be in the enclosure too?
The device is designed for active freewheeling so that the mosfet body diodes conduct for a very short time, keeping freewheel losses to a minimum. And I agree that decoupling should certainly be included in the enclosure.