Is it good practice to have different users set up for each different CTI RP?

A UCCX system is used by two or more different groups - Sales, Accounts, IT each with their own scripts and CT RP`s for access numbers. Would it be best to create an application user for each "call centre" to separate the different groups and assicate the differnt CTI RP`s and ports to each user or just use a single user and associate all the CTI RP`s and Ports to the one user and separate the scripts in UCCX?

thanks