The script is here : Launch emulator script
Actually it’s just a thing to save the association with emulator/rom in a file. You have to edit it manually, but when it’s done, it’s done.
Since I’m still in 0.3 I’d never experienced any kind of problem with stability. But I don’t play pcsx a lot.
After a quick look at the launch script I think it’s not up to date. I will check this later.