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I'm also sceptical. It depends on how short your short stack is. For instance, a hand I have had trouble with in SnG's & MTT when short stacked is pocket Jacks. On several occasions when I've had about 5 orbits left (M=5) I've pushed all-in with my Jacks, only to be called by bigger paint (usually AK/AQ). This only gives me about a 57% advantage, with my whole stack and any chance of a come back on the line. I therefore think, in this particular case, it is better to raise preflop, and judge the flop after for the allin, as your then about 75% against AK/AQ, as well as having an escape route if the flop goes against you.