We will include this change in backlog for future development cycle.
Currently, as you pointed out, there is no way to add “result_type” to API calls on iOS.
You can set
dataSource.topTweetsOnly = false
So that your timeline will be default to “result_type=mixed”.
Or adding “since:~” with to the query could be an option too.
EX: * superhero since:2010-12-27 containing “superhero” and sent since date “2010-12-27” (year-month-day).