The only XDs that are available with a manual safety are the 4" 45 models. My understanding is that they were built for use as a LE pistol but they never really caught on. In the polymer world people see a manual safety as not needed. I have never held an XD with a safety but would love to take one apart and see how it all functions.
If the pain is lacking so is the discipline...
"the only 911 call I need is chambering a round" - Mr. Muller, MO car dealer