This request for enhancement may have been asked before but since the Search page doesn't work, here goes.

I've been able to recover many GB of diskspace by uncomprompessing some large sets and then compressing using 7zip. I saved 6GB alone for Amiga Games ADF. GoodN64 saves about 20GB. The trouble is, Rebuilder can't read .7z files. Any change of 7zip file support in Rebuilder's Source in the future?

Just a suggestion. :-)