This is absolutely doable. You might notice that when you build your Simulink model and download to the Speedgoat target that there is a SimulinkRealTime.target object called "tg" in the base workspace.
If it isn't there, you can also execute the following in MATLAB.
From the tg object, you'll be able to see various information about the target computer: name of application on target, status, signals, parameters etc.
The object also has some methods you can use for getting and setting parameters on the target. In particular, try using "tg.setparam" (setparam).