Retrogrouch in Training
Join Date: Sep 2004
Location: Knee-deep in the day-to-day
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Bottom bracket or hub? Or do you mean a bottom bracket lockring on your freewheel hub?
If it's the latter, I'm inclined to say yes. It won't actually prevent your cog from threading off as a number of folks here can personally attest to, but it may take longer before that happens. Add some blue loctite for a little extra security.
On the other hand, if you have a Quickbeam you probably have a better bike budget than a lot of folks. I'd build up a new wheel with a proper track hub.