It can definitely be done as the theme is not encrypted. Yes, some users were able to modify Classipress and use it on a different niche other than the default classifieds platform.
Please help our moderating team work more efficiently by not sending us support questions via PM. You can read more about how AppThemes support works
here. However, you can send a PM to follow up and remind me if I missed your support request/thread.
Thank you and have a nice day.