I am also curious. 
Anyway what type of games do you play with your feet? Isn't it hard for really action based ones?
I use my big toes for everything pretty much, I keep the KB/M on a computer table like normal I just raise the computer chair as high as it will go and rest my heels on the table as you would your wrist and just move my foot depending on what key needs to be pressed.
As far as the mouse goes, same concept I put my right foot on the table and use my big toe for the left mouse button and use the right part of my foot to use the right mouse button.
In FPS I make the right mouse button go forward and make strafe left/right/down to the arrow keys respectively, I use the left part of my foot for those.
I want to get a better gaming mouse but all tne impressions are for hands:) So I guess I';ll have to experiment. The thing that I hate is triggers/bumpers on consoles, they';re my bane. Since I put all my controllers on the floor (except Wii) the R2/L2 buttons on the PS3 kept pushing against the floor making me have to buy the adaptor to use my PS2 controller.
Although from what I';ve heard you don't have to be handicapped to hate them:)
When I play the Wii I can use my right arm well enough to hold and aim the Wiimote I sit on the couch and turn the nunchuck to the left a little and use my big toe to move the stick and just use my little toes on my right foot to press the Z and C buttons (although it is sometimes hard to press the C button).