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Nice, but so where is this advanced speed hacks menu then?
Looking at the menu source at https://github.com/libretro/pcsx_rearmed/blob/40c380a8e8080ecb38159ee5aad1ce149e9889fc/frontend/menu.c , there seem to be a ton of options missing, such as plugin selection, memory card options, advanced speed hacks etc.
It looks like these options were part of a native menu system of the standalone emulator which is disabled/unsupported in Retroarch. I made an issue here: https://github.com/libretro/pcsx_rearmed/issues/176
You can see on this blog how the menu options in the original emulator looked. They appeared on a press of ESC.
https://retroresolution.com/2016/01/01/playstation-emulation-on-the-pi-enhancing-the-experience-with-the-options-menu-part-one-basic-features-and-save-states/
Since the native menu system is based on a menu rendering library not available in Retroarch (libpicofe), the solution is to map all the missing options into the Retroarch Quickmenu. Currently, only some of the options are mapped to the Quickmenu.