@trapexit I am having the same issue as @escc1986 where I am unable to reload in Mad Dog McCree. I am also having similar issues with Space Pirates.
Other ALG games I have tried the reload works fine (Crime Patrol 1+2, Mad Dog 2, Last Bounty Hunter). I have settings > input > port 1 controls > gun reload mapped to mouse 2 (pump action on my lightgun). I have also tried mouse button 3 and mapping either to AuxA to see if that made any difference, but it doesn't.
I am using lr-opera 1.0.0 3849c96 on a Pi4 running Retropie with RA 1.9.14. Port 1 is set to 3do lightgun.
One thing to note about Mad Dog McCree is on an initial load of the game I can shoot/reload on the main menu using the pump action, but in game it fires shots (same as the trigger/mouse 1). Once the .srm file is created, If I exit the game and start it again reload no longer works at the main menu, it instead fires shots.
Please let me know what additional details I can provide.
Side question: does opera support 2 arcade lightgun for arcade games such as Shootout at Old Tucson? I am able to get the game to run with 1 lightgun (which is detected and plays as player 2), but I am unable to get 2 lightguns to work. I can start a new thread for this if it is preferred.