Dear Fabio,
Sorry for my slow response to your response - I have only just seen it.
Thanks for the extra detail as to the rationale of the app and it's plan, The features you discuss are all really useful.
Have you discussed them with the moodle mobile team?
I was at the UK moot last week where there was quite a bit of discussion about the offical app. The message I got from Martin and Moodle HQ is that they would love for people to join forces and work on the official app. Adding Web services into moodle and increasing functionality on the app - the features you mention where on peoples wish list.
All the best
Mark