oh, a simple way is: select "save state" (in analog enviroment), which includes many options, one of the them is model path, so each time you loard you design, the saved state will be loaded, and so does the model path stored in the state.
however, if you start a new design, you still need to locate the model file for the first time, i know that is still be tedious, since the model path incide the ncsu cdk is long, so you could simply copy the model files of your interest to a short path, like /home.