It has an option -N that can be added to the command line to enable it. QAAC is also the only AAC encoder with the ability to peak normalise. MKVToolNix compensates for the padding when muxing audio but I don't think any other muxing programs do.
Partly because it has a -no-delay option that gets it to remove any encoder "padding" from the beginning (extra silence). It should help you find the various AAC encoders and/or the files they depend on. I wrote a bit of an essay here a while back. If you use the default variable bitrate quality setting for each you probably can't go wrong. The AAC encoders should all be good at reasonable bitrates.
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