I'm attempting to collect as many of the simulator bugs as I can right now. We're aware of several issues (intercepting the light button when it shouldn't, font inconsistencies, etc.), but if there are any others you have not already seen reported or discussed here in the forums, please let me know.
Keep in mind that this is a simulator and not an emulator so it's unlikely that we will do much in the short term to address things like simulator speed/performance vs. device hardware.