Here is a link to several videos of Sencha running in PhoneGap (and MacGap).
Im always happy to answer questions. (although I don't claim to be an expert) I have been deploying Sencha Apps wrapped in PhoneGap for several years and am willing to share any insight that I may have with the community.
Also I have posted examples on GitHub: https://github.com/RandyMcMillan
Have at it! (: