Wait, I thought that Mame analog+ supported all 49-way sticks? I have a pair of Arch Rivals ones, and I talked quite a bit with the analog+ guy and he never mentioned that they wouldn't work.
The reason a flight stick would be sucky for Sinistar and other 49-way games is because on a 49-way joystick the pivot point is a couple inches down from the ball, in the middle of the shaft, while flight sticks pivot at the bottom of a much longer shaft. So basically you have to move them too far.
I wonder if some genius out there could rip up a cheapo analog PC stick and a Wico balltop and mate the two of them?