i was talking kinda the same thing in this forum before as well as requesting that feature on canon 5d mark iii, but seem like majority people do not use that kinda function. i love to have those functions on my canon 5d mark iii. with those function available, i am going to be act much much quicker in av/tv mode under low light or some situations that light is changed all the time (i.e. shooting in cherry farm in a windy day). for now, i have to use manual mode for most of my shoot until i am having those function in my canon 5d mark iii
CANON CANON CANON.... please put that feature as an option on canon 5d mark iii since it is a semi-pro camera so that we can act quick on any mode. another feature that has been removeD out is that "HIGHLIGHT ALERT SHOULD BE AUTOMATICALLY AVAILABLE WHEN PRESSING INFO BUTTON". this feature is kinda handy on my canon 30d. my canon 7d does not have this feature too, not sure why and when they decided to remove it out, but i am loving it.
in short, i guess the answer to your question is "NO" since i have digged in and find that function before. there is a trick which is half press the shutter before the expiration