muss "do" command for arbitrary tasks?

[rwstauner]

do_commands:
  docs: muss run something-to-generate docs
  pg_dump: muss run postgres env PGDATABASE=cluster3 pg_dump -h postgres -U postgres > tmp/muss.dumpall.sql
  pg_restore: muss exec postgres psql -h localhost -U get_smart -d postgres -f - < tmp/muss.dumpall.sql

Not sure about the command syntax though... do we put muss run in front of everything for maximum flexibility? or assume that commands would be run in a given container?
Then the do commands would be discoverable through muss help.