It is abit complicated for me to follow and keep track in an efficient manner of all the reports and suggestions concerning the Driver.
Using Indi's GitHub issues was an option but I think we shoudnn't use it for "loud thoughts".
So finally I beleive the " OnStep Fork " is the right place to use since it will use only OnStep user's time.

I believe your Focuser Interface is at the right place since it is more indi related than pure OnStep, but leave up to you to open an issue as reference.