Flycast Naomi issues on Android

Hello all:

Some questions regarding two issues I’m having with Naomi games in Flycast.

First, both Super Major League 99 and World Series Baseball boot but almsot immediately crash after the Naomi screen. The time is inconsistent; once I did get some graphics in smlg99 before crash. They run great in the standalone Flycast apk, but there the control axes are inverted and there seems to be no option to remap them properly (i can map them to a different analog stick but they’re still inverted).

Secondly (this is a much dumber question), how the heck do I map the service and test keys in the libretro core? I set the core option to enable the service button and restarted Retroarch, but I see no place where I can map them.