getting the german audio for this movie shouldn't be a problem. but why would you want it? do you speak german?
increasing the bitrate helps to keep the video from creating problems in the encoding. remember, you doing a conversion from a highly compressed source (around 16.5mbps), apply color-correction to it. i would pump every possible bit into the video to keep the video problem free as possible.
that's why i suggested to drop all audio except english. but also not go crazy on the subs. no one needs 25 subs in all sorts of languages.
but that's just me ;)