Hi. Indeed billm has not been online on any of the Mazda forums for quite some time.
I actually did some beta testing for him on the VIW module. It's basically a potentiometer wired up to his custom control module which (with the wipers in the 'off' position) triggers the wipers into thinking you've flipped for the mist function. Depending on the position of the knob it does it as little as once a minute approx. or every other second. Here's the link to the applicable thread on M3F. Note that this forum does not allow direct linking to competing sites so you'll have to remove the space between '3' and 'forums' to make it work.
http://www.mazda3 forums.com/index.php?topic=30885.msg744940#msg744940
I don't know if he's really still around or if he'd be willing to make any more modules at this point but you could always try e-mailing him. I also did the 'poor man' version of his A/C mod. Basically a switch connected to a resistor to fool the thermistor into thinking it's actually five degrees (roughly) warmer than it is. This is the same setup billm started out with before he built the timer module.
I don't have schematics for the module he built, however I could probably remove it and take pictures of the board if that would help you build your own. If I were looking for a contemporary forum member to build something like this I would ask upashi on the above noted site. He's made a number of little electrical mods. and frequently builds his own circuits like this. I currently have a DRL module he made that I need to install and test for him.
If you need anything else just let me know.