Hello Juan,
the file is the following:
LimeWire/core/com/limegroup/gnutella/settings/ConnectionSettings.java

Two lines I changed:

157:
FACTORY.createBooleanSetting("ACCEPT_GNUTELLA_DEFL ATE", true);
I changed the true for a false
FACTORY.createBooleanSetting("ACCEPT_GNUTELLA_DEFL ATE", false);

167:
FACTORY.createBooleanSetting("ENCODE_GNUTELLA_DEFL ATE", true);
I changed the true for a false
FACTORY.createBooleanSetting("ENCODE_GNUTELLA_DEFL ATE", false);

I don't recall changing anything else.

I know also is not the best idea, but I am on the same situation, for prototype purposes.

Hope it helps!
mikejim