My question is very simple to understand. What control should I use for this game?
Syvalion's original device is a trackball. I don't know if it's used to do so, but usually when I find a game that uses trackball, on the emulator I use the mouse and that's all ok with movements.
Using the mouse on Syvalion.... it's a pain. A kick in the fingers (original sentence censored). Not only my movements are poor in quality but also the dragon goes terribly slow. I don't know which should the speed one may achieve on an original cab so I make a comparison with the demo speed. If I use keyboard instead, without changing any analog setting in MAME, the movements are much easier but also much faster than demo, I feel like that speed is too much and it's a sort of cheating, and - again - it seems weird to me that we are allowed to use keyboard/joystick to emulate a trackball.

Until it's personal fun and no recording is going to be sent... this is not a problem. The fact is that I "may" far far remotely like to try get a good score and already I have an old INP ready, so I would like to know what is legit and what not. Or better, what most follows the common sense.
Thank you in advance for whoever takes two minutes to bring enlightment in here

