Hey, I just found out from xda-developers that Vignette supports auto-flash on the X10. I downloaded the demo version and it works! By that I mean that the LED flash turns on momentarily as you take the picture, unlike the built-in Camera app where you have to turn it on and off manually through settings (even an on-screen button would have been better).
Have you ever tried taking a picture in a fairly dark room using the manual LED flash? That thing is blinding!