Customization of easySocial

Hello everyone,
I bought the extension "Easy social" but I don't know if it's really suitable to my needs.
The tool allow to build easily a powerful social network but it's not exactly what I'm looking for.

I will try to describe quickly my project:
I have to develop a web platform which will allow to registered users to post some sales/purchases propositions.
In my project the registered user fills a form to specify all the details about his product or service and submit the proposition for appoval.
After approval by the moderator, the proposition become public. When a proposition becomes public, it's displayed on the homepage and a mail is sent to all
the other users, who select "automated notification" during the registration.

In my project, the users can not communicate directly between them.
They have just the possiblity to post proposals by using form and answer also to a proposal by filling a form which will send a mail to the moderator.


So I was looking for a good tool to manage the registered users with a dashboard to see user activity and a friendly "backend interface" to manage all the account.
Another interesting function in easySocial is the possibility to send directly mail to a group of registered users.
However I realize that I have no need to most of the other functions so I'm wondering if I can deeply customized the extension regarding my needs.
I need also to modify all the views (registration/sign in...) in order to match to the graphic work already done.

I will be pleased to have your opinion

Thanks