Thank you for your answer.
I've considered cloning the module, but if I do that, how can I make the "Forums" application from the Portal map to my cloned forum module instead of the original forum module? Will I have to duplicate it somehow and modify it somewhere? If so, how do you even duplicate an Application? I assumed that the application is basically the set of settings from the "User Interface" tab in the module, but when I cloned the module I didn't get a second "Forums" application. Also, when I cloned the forum, the classes were not cloned, although it was selected to clone every child. Do I have to remake each class manually?
And if the above works, will I have to clone the webpart and widget for displaying the forum afterwards? (in order to make them work with my new forum class)
Sorry for all these questions; I'm pretty new to kentico and I think I keep missing something and overcomplicating things.