#5 Perhaps use better compression library?

[TPS]

AdvanceSCAN is using 7-Zip's zip compression library,
which can be tuned to be far & away better than zlib. (I
use 7-Zip regularly for my zip compression needs.
Giving the -tzip -mx -mpass=4 -mfb=255 switches to the
7-zip command-line, on average, is between 1% and 5%
better than, say, zip -9.)

Just an idea, for perhaps your next (or some one after
THAT =) version-level change.

Both of these are open-source & hosted at SF:

AdvanceSCAN is found at
http://advancemame.sourceforge.net/scan-readme.html

7-Zip is at
http://www.7-zip.org/

[Glenn Randers-Pehrson]

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pngcrush won't use compression methods that aren't listed in
the PNG specification.

[Nobody/Anonymous]

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I am not sure what do you mean by that, glennrp, because 7-zip uses deflate as well. If there is any specific submarine patent threat, the last thing to do is to look for potential threat, because that can land you triple damage in US courts. Unless someone is sending lawyer letters to you, there isn't any reason not to implement a better deflate.

[Nobody/Anonymous]

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I misunderstood and thought you were suggestiong lzma compression. I will look into using 7-zip's better deflate compression.

Thanks/ glennrp