I don't have "authentic" documentation stating the particular uses/non uses of a creeper gear, although I feel confident that something along those lines does exist.
So I did a quick search and came up with a number of threads concerning this very topic, here is one that pretty much says it all, and to top it off, most of the posters are people that I have a great deal of respect for and whose opinion I trust very much.
http://www.onlycubcadets.net/forum/s...hlight=Creeper
And another...
http://www.onlycubcadets.net/forum/s...hlight=creeper