thank you for your feature request. In the next V5 release, Royal TS will remember the check state. So you only have to disable the option once and it will stay disabled until you enable it again.
I hope this helps.
The feature has been implemented in V5 and is ready to download:
Title. I would like to disable the preference setting "Remember Password for subsequent Documents", but I do not see anyway in the Royal TS app to do so. Can this be added to Royal TS in a future version? I want Royal TS to start without this preference already checked. I have attached the picture of the problem area.