Hello Subhashish! As I mentioned in the release email, categories are what we are working on next.
And cropping and editing - on Android, I believe that the app should *not* have these features. Because files are shareable, you should be able to use any of the many image editors on Android and use those to crop, edit, etc. Searching Google Play for 'Image Editor' produces a lot of hits, and you could try out which one you prefer :) Also you can share directly from those editors into commons, so it is a reasonably neat workflow. Do file a bug, however, to help keep track of these :)
-- Yuvi Panda T http://yuvi.in/blog