Warlords is classed by MAME as using 'paddle' input type, and in this case it is right! Spinners will work, but depends if you want the original feel...
I think you could interface 4 spinners using MAME Analog + - a spinner on each axis of 2 mice. MAME's standard ctrlr ini files have this:
P1_DIAL "KEYCODE_LEFT | JOYCODE_1_LEFT"
P1_DIAL_EXT "KEYCODE_RIGHT | JOYCODE_1_RIGHT"
P2_DIAL "KEYCODE_D | JOYCODE_2_LEFT"
P2_DIAL_EXT "KEYCODE_G | JOYCODE_2_RIGHT"
P3_DIAL "KEYCODE_J | JOYCODE_3_LEFT"
P3_DIAL_EXT "KEYCODE_L | JOYCODE_3_RIGHT"
P4_DIAL "JOYCODE_4_LEFT"
P4_DIAL_EXT "JOYCODE_4_RIGHT"...so in theory it can probably handle 4 spinners.
I wouldn't have thought any consoles use spinners, paddles perhaps...I got into consoles when all you got was pads, so I'm probably wrong on that
