I tried to add my own package map, but it didn't work. Tried it with 2.1.0-SHAPSHOT.

Adding a defPackageMapURL seemed to do nothing at all, since the info output kept saying built-in:
[INFO] default package map      : built-in

Adding auxPackageMapURL resulted in the correct info output
[INFO] auxiliary package map    : file:/Users/markus/Documents/workspace/iPhoneTest/pm-iphoneos.xml

But the new distro "iphoneos" didn't work:
[INFO] Package maps document set no packaging for distro: iphoneos

I have attached the pom and the pm-iphoneos.xml, maybe I'm just doing something wrong.

Additionally in the documantation wiki, it says the parameters would be defPackageMap>>>s<<<URL,
auxPackageMap>>>s<<<URL. There seems to be an "s" too much.