@holto keyboard input is a bit tricky for this core unfortunately, however there are some workarounds.
Refer to the Joypad documentation of lr-scummvm: https://docs.libretro.com/library/scummvm/#joypad
You will see that some buttons are mapped to special keyboard keys. For example X is mapped to ESC, L1 is mapped to Enter, R1 is mapped to Numpad 5, and so on. Furthemore, you will notice that the Right Analog Stick is mapped to a Virtual Numpad.
In the same documentation, you will find these notes, including text in save dialogs:
Esc:
* Skips cutscenes.
* Opens/closes menus in some games.
Virtual Numpad + Numpad 5 + Numpad 0:
* Enables control during fight sequences in the 'Indiana Jones' series of games.
* Enables bypass of Monkey Island 2 copy protection.
* Enables saving in games that require text entry when naming a save slot.
* Enables menu navigation in some games (Numpad 8 == up, Numpad 2 == down).
Enter + Backspace:
* Enables saving in games that require text entry when naming a save slot.
* 'Enter' may be used to attack in 'Full Throttle' fight sequences.
* 'Enter' enables menu item selection in some games.
. (period): Skips lines of dialogue in SCUMM engine games.
F1:
* Shows in-game menu in some games.
* Enables saving in some games.
F10: Shows hotspots in Simon the Sorcerer 1 + 2.
So, for example, if you need to save a game that requires text entry for the name, it should work by just pressing Enter which is L1 in the gamepad mapping. You may input numbers as the name using the Virtual Numpad, or delete mistakes using Backspace which is mapped to L2.
I haven't test this myself in a while so can't guarantee precision on this information, but you should be able to achieve what you need with these directions. If you can confirm further for the rest of the users in this topic, that would be very great !
