multi-directional slidding for these keys enabled?

Great, I can do that but doesn’t Fitaly have to support multi-directional sliding for these keys first?

I tried adding "-", "!", "‘" and "?" at the bottom of the SE.kbd but it didn’t take, I also tried adding 1, 2, 3 and 4 but these don’t appear in the Fitaly Customizer either when the file is opened.

Thanks :)