Hi Marcos
in order to choose if your project will get deployed in a zipped way or as exploded war from JBoss Tools, you'd usually have to set the appropriate setting in the server editor. On the 2nd tab of the server editor you have a checkbox that allows you to choose either deployment type:
http://community.jboss.org/servlet/JiveServlet/downloadImage/2-627954-17043/450-419/deploy-as-compressed.png
I guess you did not touch this, didn't you?
Cheers
André