If you can find one of the older blue 10,000 RPM "Control" motors (they used to be included in the (long since discontinued) 60-7501 ZipZaps Performance Booster Upgrade Kit), in combination with the blue 12 to 1 "Stock" gears, your ZipZap will crawl along unbelieveably slow. Real speed is 1.367014 MPH and scale speed is 87.48888 MPH (according to my ZipZaps Speed Calculator), but it will go a bit slower than that (due to friction, battery condition, laws of physics, etc...).
Everyone always seems to have a major speed-fetish with these little cars, and allthough I do too <G>, I LOVE my blue motor and gear combo... perfect for extremely small table-top racing (if you can even call it "racing" <LOL>!) -
(real handy when pressed for space like I currently am ->
http://www.cmoo.com/~snor/weeds/Weed..._Homestead.htm <LOL>!)
Anyhow, that may be what you're looking for, speed is extremely slow with the afore-mentioned combination, as well as having precise steering and control.
P.S. In an SE it would be even slower (due to the additional weight of the SEs, as well as being able to control the speed via the pistol grip analog throttle).