Q: Can you add .... mod?
A: Send a message in the discord suggestions and ill check it out (curse links only exceptions can be made if you can verify the sites safety).
Q: It crashed why?
A: Look at the crash log and post it in the discord. A reinstally might help out as well.
Q: Its too laggy.
A: Add more ram its does help.
If not answered here go post in the comments or in the discord.