Add a plugin to Limewire

Hello,
First i'll ask you to not pay attention on the mistake i'll do 
because i'm not an expert in english :)
Thank you for help

So, i have a project which is called "Extend P2P application with 
social network" wich means add a plugins to limewire (the P2P 
application i've chosen) that will turn make looks like a Friend to 
Friend software (like Soulseek for example). 
For that, I need to locate an user, add it in a contact lists (which 
needs to be saved) and set 3 differents type of "trust" (low, medium 
and full) which allow the contact to have access only to the files 
that i want him/her to. I also want to share my files only with the 
members in my contact list
I've seen some classes i can use or modify to do this, like:
-Class ChatManager: this class contains a fonction that i can use 
to "block" the connections with all the users that aren't in my 
contact list. But I would like to know if the "blockhost" fonction 
blocks all types of connection or only the InstantMessenger messages?

-Class BandwidthThrottle in org.limewire.io : By setting the 
bandwidth at 0, will it has the same effect than the blockhost 
fonction in the ChatManager class?

I want to create a profil that can be seen by my contacts but i also 
want the profil to be extensible. I mean i don't all my contact to 
have access to my family pictures for example. I though about a file 
(3 files in fact, one for each level of trust) in the mediatheque on 
which i'll apply a restriction to some members.

My questions are the following:
-How can i make a contact list and save it?
-How can i block some contact to make my 3 different level of trust?


I hope i am clear and you will understand what are my problems. I 
thank you for help and i'm willing to answer any question if i've 
not been enought clear on some points.


PS: i can speak french but  i hope my english isn't so bad...