Question about controller issue with Sinden lightgun on Flycast

I wanted to try Sinden light gun in Flycast Naomi, specifically House of the Dead 2

However there is an issue. https://www.sindenwiki.org/wiki/Retroarch#Dreamcast.2FNaomi-specific_settings_.28core_settings.29:

Instructions are as follows:

Dreamcast/Naomi-specific settings (core settings):

*Start a Dreamcast or Naomi game*
  • Press F1 for quick menu*
  • Scroll down to “Options”*
  •    Turn Show Lightgun settings to "on"*
    
  •    Exit quick menu and go back to the game, then go back into the quick menu for the lightgun settings to appear in the Options menu again*
    
  •    Turn off the cross-hair in the newly displayed lightgun options*
    
  •    Press the right mouse key to go back a menu*
    
  • Scroll down to and select “Controls”*
  •    Go to Pad 1*
    
  •    For input type, press the right arrow key to change to Lightgun*
    
  •    Go up to "Save Core Remap" (this means all Dreamcast/Naomi games with this emulator will recognize you are using a lightgun)*
    
  •    press the right mouse key to go back a menu*
    
  • Scroll down to “Overlays”*
  •    Turn show overlay to "ON"*
    
  •    Select "Overlay Preset"*
    
  •    Navigate to one of the Sinden Borders, such as the medium white and select*
    
  •    Select Overlay opacity and make it 1.0 (this makes the border fully white instead of kind of grayed out)*
    
  •    Turn off the option for showing the mouse cursor with an overlay*
    
  •    Right mouse click until you are back at the general quick menu again*
    
  • Scroll down to Overrides*
  • Select save core override (this means all Dreamcast games will use the options and overlays you set so you won’t have to do this again for Dreamcast)*
  • Exit out of the quick menu by clicking resume or F1 and play your game*

If I change Pad 1 to Lightgun, there is no way to map coin and start controls, as there are no buttons. So if I lose lifes, there is no way to continue.

Only way is to have a gamepad connected to Pad 2 and then switch pad 1 and 2 everytime to insert coin or press start. How do I map buttons to Lightgun control option?

I haven’t done much with lightguns, myself, but talking to another one of the devs, he said to assign the lightgun inputs in settings > input > retropad binds > port 1 controls, and then you shouldn’t need to do any remapping in quick menu > controls.

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