PotbellyPig, it's already there because I also do the same. ( hehe, I am a heavy user of SABU. I need to hide all subtitle when I listen it the second time ).
Just turn the iPhone sideway ( full screen in landscape mode ) and then press twice on the subtitle. ( press once would toggle to auxiliary subtitle, press twice would be no subtitle ).
Just turn the iPhone sideway ( full screen in landscape mode ) and then press twice on the subtitle. ( press once would toggle to auxiliary subtitle, press twice would be no subtitle ).