The 60D has exposure simulation, the 1100D does not. I've never looked for it on my 40D.
I've always had this enabled but also doesn't seem to have an effect for astro in bulb mode.
It may be that upping the ISO works when Expo. Simulation is disabled(or not an option)
Pretty sure that the sensitivity is at max in the 'bulb' setting as I've never been able to get it to increase.
Edit: Just checked the 40D, no Expo. Simulation.
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