Metal Gear Solid: Peace Walker

[chiffon_rouge]

I'm currently playing Peace Walker on Debian, using the v0.9.8-551-g253e11a 64bit build and I have trouble passing Mission 19 where I have to mash the action button to get past the shutter doors. The problem seems to be that PPSSPP doesn't recognize the repeated input of the same command in a short amount of time, neither with my game pad nor via the keyboard.

Did anyone here run into similar trouble? How can this problem be solved?

Thanks!

EDIT
I tried using the rapid fire button, which didn't work at first, but when I changed my button layout to the second non-standard one (I believe it was called "action type") and *then* used the action button (which was the triangle button with that setup, not the D-Pad) together with rapid fire, it worked.