ABE patching

Hi,

I was wondering if there was a way to apply local patches to toolchain components (gcc, binutils, glibc, etc.) when building with ABE.

The only way I know of right now is to mirror the upstream repository into own git tree, patch it and point ABE to it; or check it out locally, patch it and pass the resulting tarball to ABE build with --disable update flag.

I know one of ABE's requirement is "Should build all toolchains with no custom patches", but it would be nice to be able to do so on top of official sources... Thoughts, comments?