Hi Nathan ...
thanks for using the community channel :)
We are always happy to help out.
The documentation will be updated accordingly, sorry for the confusion, but both instance-selection and call-path is already possible for the sdb (simatic-debugger) via UI and via CLI.
We call it trigger-conditions in SIMATIC AX.
See:
Callpath & Callinstance (setting up trigger condition while debugging your code)
Let me know if that helps.
Greetings
Stefan