The source for V3.11 and related project templates for IAR 4, IAR 5 and GCC is available from google code:
http://code.google.com/p/dsonano/
Max Vpp with the standard 1x probe is 80 Vpp (10V/Div) and 800 Vpp with a 10x probe (100V/div). There is now an additional 0.2V/Div for 10x probes, but apart from this, choice of attenuation is unchanged.