Lemme preface by saing I take no responsibility for this, but also, what've you got to lose? 
Search for the module_keybinds.lua file and make a copy.
Open the original in notepad.
Search in the file for OnReceivedKeyFromEngine.
Directly below that line, paste this:
if keyString == '\'' then
CancelKeyBind()
return
end
Uhm, just an edit to be clear... actually copy paste that code above, or if you type it, it is a single quote, a backslash, and two single quotes after ==, no double quotes anywhere in there.
Save it and see if it works. If not, just restore the backup you made.