The dock_mcm flag was apparently deprecated in 3.1 and nobody fixed the documentation. dock_mcm is the default behavior (the other options being dock_min and dock_ppk).
The warning about Dunbrack02.lib.bin is standard the first time you run Rosetta on a new computer. The Dunbrack library is fairly large, so to speed processing Rosetta will rewrite the ASCII database into a binary-encoded database (a serialized object) for faster reloading. You shouldn’t see this error in subsequent runs.