Yea, I get the cost factor. But as a $5 temp. vs a new board set, etc. it could be useful for some folk. (these components are far cheaper online that they were at RS)
You knowing was my only concern. It's more of a temp. fix unless you are a looper. Better in a long range train vs a camelback too.
If you have trouble with finding the light, consider one of the aftermarket detail offerings for adaption. (careful, detailing is very addictive and uniquely satisfying once you get over the unintuitive reluctance involved in changing the "as delivered" look; then they become your "babies" 
)
Another idea; add a switch to a motor lead so you could keep it on a shelf and power it up for lights, sound, etc. without fear of a sudden "launch" if it changes modes unexpectedly. You wouldn't be the first, and imo, a camelback is interesting enough to always be shelf worthy.
