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If it doesn't have a lockring, how is the sprocket staying on? If you're leg-braking, then you need a lockring or, at the very least, for the sprocket to be permanently bonded to the hub.
Using a road hub, fixed without a lockring is known as a "suicide conversion" for a reason.
If you're skidding with neither of those that's up to you, but if you're gone to state that something which is normally dangerous is safe, then you need to explain why that's the case.
Scilly.Suffolk-
There is a regular cog thread and no lockring thread, simple as this, I was riding it like this for long time brakeless, leg-breaking and skidding and unless your name is Forstemann you won't be able to unscrew the cog by riding, but it comes off easily with chain whip. Its known that low count cog won't unscrew from a hub, not enough leverage or something, i'm not a physicist, but i know that for sure from my experience.
roe
Thanks for your valuable input ;]. Obviously you know everything. I'm sorry that I annoyed you with this thread, master. :D:D
Edit: btw you made my day! :D