Hi there, thanks for providing this feedback.
While enabling this permanently may cause the novelty to wear off, I will certainly make sure your suggestion is forwarded for further review. I will also redirect your query to our feedback forums to help raise interest and awareness in our community.
In the meantime, if you have any further queries or would like to provide any additional feedback, please feel free to let us know.
i'd like to add that utilizing the code already in game to display/enable local effects only should be able to utilize the special event effects either in customs or in regular matchmaking so if someone wants to see and hear light sabers they should be able to theoretically. branching off of this, if everyone in a customs game wants to hear/see light sabers they can and will be able to and for those who don't want certain effects or whatnot they would be able to filter those as well presumably.