Would be great in a future update:
1. You can choose the mixdown video settings when making a AAF file. And therefore not a mixdown video of the default sequence settings format (in my case 4K, so huge mxf file)
2. A possibility to make a AAF of nested sequences. Now Premiere Pro exports the audio of a nested sequence into two mono files (left and right bounce) instead of all separate audio files in the main sequence.