Easy fix example:

--> 2nd box keybind for Open Chat --> change to "`" (that's the single-quote under the tilde (~) key if you can't see it that well)
--> Both boxes keybinds for Open Chat Slash --> Change to "]"

Now, when you want to type, just press enter and it will open the chat box on your main only. THen when you want to type slash commands, press "]" and type in your "/dance" or whatever.

I'm assuming the second one will work as I don't have Open Chat Slash changed from default (not needed with my hardware setup).