Proguard: impossible to optimize/shrink

[pekd]

The -dontshrink and -dontoptimize options for Proguard are hardcoded in mx. This makes it impossible to have a distribution that is optimized by Proguard. Is it possible to remove these two options from the default and make them opt-in, or at least provide a way to remove those options from the Proguard command line for specific distributions (e.g. a new property like shrink: true)?