

I use RetroArch btw on my tablet with a cheap Bluetooth gamepad, and have L3+R3 (pressing both sticks) configured to bring up the menu where I can save/load states, take screenshots, etc.
RetroArch also allows you to map actions like fast forward or slowmo to gamepad buttons, and make it so you have to hold a specific button to activate hotkeys.
I used it a lot until it stopped working (presumably because Google broke something), then RiMusic but that had broken queue saving, forgetting the queue randomly.
Now I use Metrolist