The best Saturn emulator on Android, Yaba Sanshiro just received a new update to version 2.4.0. The emulator, which plays many games at full speed on the Nvidia Shield TV and many other devices received an important usability update.
According to the release notes:
WHAT’S NEW* in-game controller configuration. https://www.youtube.com/watch?v=LjwSuPTWgy0
* Riglord saga 2 is playable now.