Simulate a chrome for downloading. It seem that some download (ndk/sdk) are faster using it.
add source.exclude_dirs and source.exclude_patterns options in [app]. Check the default.spec for informations.
add the possilibity to use the content of a section as a list. Ie, instead of doing "source.exclude_dirs = dir1,dir2", just create a section [app:source.exclude_dirs], and put one directory per line.