I can think of TONS of services I've used over the years, both in and out of the software field that have talked about adding features and never did. Big deal, don't play the victim.
If you really wanted onto the trusted tester program, you'd bring it up on the app engine mailing list or contact someone at google directly (their emails are all over the place, Ikai is a great guy, and they are very responsive). I'm sure they'd be happy to have enthusiastic beta testers.
I find great irony in your quote on your G+ profile:
"Do you create anything, or just criticize others work and belittle their motivations? -- Steve Jobs"