I had my settings to show a full screen C64 but the over-scan did not suit the ZX Fuse too well, so I changed a bit of code that I had used previously to just run the VICE emulator in the right aspect.
I changed from Squeeze to Wheezy to install FUSE from here, VICE is not completely in the Wheezy is not completely in the Wheezy repository yet so I used this workaround.
to set up your boots, use this code, but make two scripts one as runemu as stated for VICE, then do the same for one called runnorm for your normal or fuse settings as the code to reboot as runnorm seems not to exectute for wheezy, but will work if you type it in the command line.
You could even add a third for PI mode.
I have a 4;3 standard def monitor, to get fuse overlaid nicely I set my frame buffers to h 585 and w 765 then over scan settings to left -45 right 0 top -20 and bottom -20
for FUSE I left all settings unaltered but this will be different for most users.
here is a short video of how I use them with my easycap dongle that I have just got from ebay!