Proofing arabic character

hello Mr Erwin Denissen
please watch this video in the link below, especially from minute 01:30 to minute: 04:04 where the connection of characters is of the following order:
isolated form;
initial form;
mediform;
final form.
respecting the meaning of Arabic writing: from right to left
how can i set fontcreator to react like this

https://www.youtube.com/watch?v=FzHlnlQAGug&t=306s

This only works within FontCreator if you uncheck the _shaper, but this is not how other shaping engines work.

thanks this is exactly what i was looking for