Randall Farmer, 21/01/2014 23:26:
Trying to get quick-and-dirty long-range matching into LZMA isn't feasible for me personally and there may be inherent technical difficulties. Still, I left a note on the 7-Zip boards as folks suggested; feel free to add anything there: https://sourceforge.net/p/sevenzip/discussion/45797/thread/73ed3ad7/
I see you got more pointers there. :) Did you manage to explore them?
Nemo