Go to User > Settings > User Preferences, and there’s an option called “Quick Couple Key” so you can change this to a backslash. Does that work for you?
I find myself using both / and \ (for math). Would it be possible to put either of these (optionally) behind a “hold CTRL” or “hold CMD” modifier as well?
Options for the “quick couple key” to allow users to embed LaTex more easily would be great. I’ll link this thread for reference here: More options for 'quick couple key'
I would +1 on allowing to customize a modifier (I like @ for example and i’m sure everyone’s got their own preference). / is quite heavily used for me as well, meaning I have to ignore the popup with actions.