Is it possible to enable touchscreen controls for the Windows version of ScummVM?

I can't get any speech to play in Touché: The Fifth Musketeer or Discworld 1 on my PSP. They run fine on my PC copy of ScummVM and I copied the folders directly over to the PSP version but still no voices on the console. I tried messing around with the game options (forced Voice only, Voice + Subs o...