Sorry it took me so long. I have been meaning to get to this for a long time. I have traced out where on the VIA module the switches from SW3 go. Unfortunately it doesn't look too interesting:
Switch 1 - VIA VT82C686A PIN U11 - General Purpose Input 2
Switch 2 - VIA VT82C686A PIN U10 - General Purpose Input 3
Switch 3 - VIA VT82C686A PIN F4 - General Purpose Input 0
Switch 4 - VIA VT82C686A PIN W11 - General Purpose Input 1
These inputs are dual purpose. They are sampled at reset and the value saved as GP Input.
After reset they function as normal inputs.
The switches are used to set a configuration that can be read as an input port by the BIOS
If you look at the unpopulated components for memory on the IO mother board, there is no
place to put a serial eprom as most memory dimms now have. The SODIM that comes with the IOpener
The size and type of memory is stored in the I2C eprom so the BIOS can config the system correctly.
My guess is if they were to populate the memory on the motherboard, they intend(ed) to use these
4 GPI bits to tell the BIOS the size and speed of the memory.
Thats just my guess about the use of the mini DIP switches.