Tom, thanks for clarifying that the domestic EFI REs are open-loop. I had read that on the Indian RE/Team-BHP forums before, but couldn't remember.
Also, I understand that low idle RPM is not good for UCE bikes. However, by low I meant RPM which is around 950 (approx) and less than 1300. The idle spec for UCEs is 1050 +/- 250 RPM. Mine is approximately around 900~950. The decomp clatters on cold starts for less than 30 seconds. But I don't even let that happen as I just kickstart it holding the 'manual bi-starter' and keep holding it for those 30 secs till the oil gets going. Depends on the weather too - sometimes I only need to hold the bi-starter for 5 seconds or less (on cold-starts) and then I let it go = nice thump thump thump around 950RPM. This is what works for me.
edit -
Also while we were on the idle RPM issue, listen to this -
http://www.youtube.com/watch?v=jku-OXow3Ns It is the domestic standard 350 UCE with carb. Now, that idle just sounds like what Iron Barrels are known for doing easily. That is surely around 800-850RPM. I can't hear any decomp clatter there albeit piston slap? And I am 100% sure if I had to lower my idle just a bit more, the auto-decomp would kick in and start its clack clack clack even if the engine was warm/hot. Interesting.