I just discovered Keyman and I’m surprised I haven’t heard of it before. I’m interested not so much in language support but in chording and macros, and I wonder if that is possible with Keyman?
For example, it would be great if I could implement this: Pressing and releasing D or F results in D or F, but holding both at the same time doesn’t send anything but switches to a new mode, so that the IJKL keys become cursor keys.
Other things I’d love to have:
- capslock key does nothing, but hold it down while typing other keys and it is the same as ctrl+alt+win+shift
- holding down space switches to a different mode, but just tapping it sends space
- adding S to the DF combo above is the same as holding down shift
- K+L + some other key sends a predefined string
- …
Basically, I want to reproduce the https://waytools.com chording keyboard layout 
Thanks for your insights!