Is it possible to set up autopacking downloaded files? For ex., before downloading, run
tar -cvj -f tempfilename.tar.bz !&
for the selected files, then do download the tar.bz, then transparently unpack it (or maybe leave as is) with a chosen (local) program.
Both remote and local commands should be configured.
I see it as an extended custom command that applies both remotely and locally.
Point is I do the thing too often manually (pack - download - unpack).