File structure for custom modules in Drupal 7

Question

Note: I have already posted this question on [SE's drupal] but didnt got any positive response there so i am posting same question here again.

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I want to organize non-core(modules that are not bundled with core) modules in Drupal 7. This is my proposed structure:

1. Contributed modules - downloaded modules that are untouched
2. Custom modules - downloaded modules that are modified to suit the requirement
3. local modules - self-developed modules

I GUESS, the best approach for this is to make three folders within sites/all/modules like below:

1. sites/all/modules/contrib
2. sites/all/modules/custom
3. sites/all/modules/local

Now, there are two ways to install a module:

1. Manually
2. From the admin panel

While installing the new module manually, everything is fine. I can just go to the directory and place the module there. But how to install a newly downloaded module in `sites/all/modules/contrib from admin-panel. Moreover, is there any better approach for organizing non-core modules?

Answer 1

Finally after banging head on google for hours, asking question on SO and SE's drupal and communicating with other users via comments, I cracked it...

Well, the directory structure is still debatable but satisfactory for me. But the answer to the most imp question is "DRUSH".

Refer this and this node from Drupal. Collectively, it has everything needed to answer my entire question.

I would also like to point you to this answer which has provided the first and most-imp hint to me.