Mon Feb 26, 2018 4:36 pm by bob
It depends a lot on what you are trying to achieve.
If this is so you can start Chat on all clients, and spam the same thing, then
1. don't because that is going to give you a bad name and people will hate on you, and
2. don't, because that is going to not help the reputation of multiboxers, which other players hate on already because they can't play good and need someone to blame, and
3. don't, because it is not being a good citizen and will get you banned.
Besides that (which could be totally wrong), if you look at your mapped keys, they are configured differently. i.e. the BACKSPACE (G20) mapped key has a target of Window: All w/Current, so the keystroke will be sent to all windows. Whereas the \ (\) mapped key has a target of Window: Current (or self), so it will only be sent to the current window (and you might as well not have a mapped key) - it also sets a repeater target for some reason, but presumably because you really want the target to be Window: All w/Current.
Also, you have those particular hotkeys in the ISB42 Combat Broadcast Hotkeys keymap, so when in Chat, after you disable Key Maps so you can use your keyboard normally, they wont be available anymore because that Key Map gets disabled. If you still wanted them to be active after you disabled keymaps, then they should be in Always On. But that also has the repercussions in that you cannot turn them off, so when just using a single window, the \ and BACKSPACE would still be broadcast to everybody, and that might be annoying for other reasons.
/e
Should probably mention that BACKSPACE is normally used by ISBoxer for Assist, so it is recommended not to bind it in game, although it might be OK provided you are not using it with modifiers (e.g. CTRL/ALT/SHIFT).