...Still, installing large collections (such as S.T.E.P.) takes many hours, mostly of menial and error-prone keypressing and mouseclicking,
The aim of modDNA is to eventually speed it up to the point of "download 'DNA' developed by guru", then "download files necessary to reconstruct this DNA" (with modDNA providing hints for download), and finally "press the button 'replicate from DNA' and wait". There is a long road ahead, but if it works - much more people will be able to enjoy improved graphics and gameplay of modded Skyrim.
A a part of the project, simple bsa command-line extractor, unbsa.exe, has been created. It is currently available in Files section. If you have problems with it - please open a ticket.
Please see link below for further details on modDNA.