1) I believe you might be entering the ipd as an integer. In python, integer division will yield another integer. So the computed ipd is most likely 0. You need to divide the ipd by a floating value. Also, Vizards units are in meters, so you need to divide the input mm ipd by 1000. The following code should fix your problem:
Code:
eyeohd = viz.input('What is the participants IOD, in mm?')
viz.ipd(eyeohd/1000.0)
2)You should use viz.HMD if the user is wearing an HMD. viz.HMD will go into fullscreen mode and use symmetric view frustums for each eye.
3)Sorry, there is currently no way to change the position of the dialog popups.