The Android dev team has generally been assumed to have a passive stance on rooting and unlocking Android devices. That is, do it if you want - we won't stop you. And there's certainly evidence abound supporting this - Google's Nexus One could be unlocked via a simple ADB (Android Device Bridge) command: fastboot oem unlock. The same is true of the Nexus S.
Of course, it only makes sense - Google doesn't want to put any unnecessary barriers between Android developers and the open source OS, especially on developer phones.