MAME does not handle dual PC Monitor guns. But it does handle dual TV guns. When Act Labs made the TV guns, they added a new switch to the design. When the switch is set for Player 1, the gun sends mouse buttons 1 and 2 for trigger and reload. When the switch is set for Player 2, the gun sends mouse buttons 3 and 4 instead. As far as Windows is concerned, it's still just a single mouse with 4 buttons. So you don't need Raw Input to handle dual TV guns.
The only reason we needed analog+ for the tv versions was because the code was broken. But the author of the troubleshooter submitted a fix to the mame devs & they rolled it into 0.96. So Tv versions will workflawlessly, but the PC vesions will not