Hi RodenJP. The “hanging” problem you mentioned is a known issue, and making adb’s waiting state more obvious is a feature we’ve requested from the platform team. So far, we have only tested the latest Nexus5 and the GalaxyS4, so no other devices are officially supported yet. Moving forward, we will be expanding the breadth of our device testing, and will officially support more devices moving forwards. As to which devices, in particular, we will be supporting, I can’t speculate on.
Also, the various abbreviations you saw are the texture formats supported by different Android devices. If you know the particular formats your specific device supports (eg. ATC for the Nexus5), then you can cook just that format. Selecting the non-abbreviated option cooks all of them; good for broadest compatibility, but can greatly extend your cook time.