Eh, how do you propose we do that?
Bioware can simply implement a system that allows those characters that can equip the item and benefit from it be able to roll need.
The other classes will be able to greed on the item. If a item contain a mod that someone in the team wants then the best way to get it is by using communication, if the mod is reasonable for the character I am sure he/she will recieve it.
Many posts here on the forum simply consists of players not knowing how to use the different need/greed/pass options, and for that I refer to the search function. You will find thousands of posts and hundreds of threads regarding the flawed lootdistribution in The old Republic.
If you have a specific question regarding this please write and I will try to explain