As a further question on that point, where would you say would be the
best place to persist that command?

As far as I'm aware, my likely choices would be one of (in order of
execution):

/rc/bin/termrc
/rc/bin/termrc.local
/cfg/$sysname/termrc

I generally avoid touching termrc, put site-specific stuff for all machines on the network in termrc.local, and put machine-specific stuff in /cfg/$sysname/termrc (e.g. one machine supports dma but another does not.)

"Cpurc" can be read for "termrc" above.

( by the way, what to do when I find errors in the man pages? .e.g., in
the interest of correcting them upstream )

See patch(1).

-Josh