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I take it you would advise removing the spacer?
Yes. Skidding or not, you only have about 70% of the desired thread engagement. The last thing you want is to strip the hub threads with your awesome starting power. As you say, you can run suicide mode if you leave the second brake on, so my recommendation (and what I use on my suicide lo-pro) is a Trialtech sprocket, which has 10mm of threads so it sticks out about 3mm further than a normal track sprocket while engaging all of the hub threads.
gbj_tester
You probably know these dimensions already, but the sprocket thread is 6mm deep as is the lockring thread.
The sprocket is 6.8mm wide and therefore overhangs the lockring thread slightly when mounted without a spacer,the lockring is 4mm wide meaning that there is ~1.2mm of spare lockring thread exposed when all fitted together.
If i add a 2.5mm spacer this would mean that the sprocket has 3.5mm of thread engagement... I had hoped that this would be sufficient as 1) I'm not particularly powerful, 2) any torque will be tightening the sprocket and 3) I don't plan to do any skidding and will probably run a rear brake to save me having to rethread the cables when I switch back to gears.
Since I plan to run 2 brakes, my understanding is that the lockring would be optional anyway but I was hoping that the remaining 2.7mm thread engagement would be sufficient especially since I won't be skidding.
I take it you would advise removing the spacer?